Invoke-AzureRmVMRunCommand and spaces in parameters

### Description

When running `Invoke-AzureRmVMRunCommand`, if the `-Parameter` hash table contains values with embedded spaces, only the part of said values left of the first space seem to be taken into account.

### Script/Steps for Reproduction

1. Create a local script (`dummy_script.ps1`) with the following:

```powershell
param(
[String]$yourname
)
"Hello $yourname!" >C:\blah.log
```
2. Create a test VM (the one used here runs Windows Server 2012 R2, in case that's relevant)

3. Run this command:
```powershell
Invoke-AzureRmVMRunCommand -ResourceGroupName "$YourResourceGroupName" -VMName "YourVMName" -CommandId "RunPowerShellScript" -ScriptPath "dummy_script.ps1" -Parameter @{"yourname" = "Max Mustermann The Fifth"} -Verbose
```

#### Expected contents of `C:\blah.log` in the VM:
`Hello Max Mustermann The Fifth!`

#### Actual contents of that file:
`Hello Max!`

### Module Version

```powershell
Get-Module -ListAvailable

Directory: /usr/local/share/powershell/Modules

ModuleType Version Name ExportedCommands
---------- ------- ---- ----------------
Script 0.13.1 Azure.AnalysisServices.Netcore {Add-AzureAnalysisServicesAccount, Restart-AzureAnalysisServicesInstance, Export-AzureAnalysisServicesInstanceLog, Sync-AzureAnalysisServicesInstance}
Script 0.13.1 Azure.Storage.Netcore {Get-AzureStorageTable, New-AzureStorageTableSASToken, New-AzureStorageTableStoredAccessPolicy, New-AzureStorageTable...}
Script 0.13.1 AzureRM.Aks.Netcore {Get-AzureRmAks, New-AzureRmAks, Remove-AzureRmAks, Import-AzureRmAksCredential...}
Script 0.13.1 AzureRM.AnalysisServices.Netcore {Resume-AzureRmAnalysisServicesServer, Suspend-AzureRmAnalysisServicesServer, Get-AzureRmAnalysisServicesServer, Remove-AzureRmAnalysisServicesServer...}
Script 0.13.1 AzureRM.ApiManagement.Netcore {Add-AzureRmApiManagementRegion, Get-AzureRmApiManagementSsoToken, New-AzureRmApiManagementHostnameConfiguration, New-AzureRmApiManagementCustomHostnameConfiguration...}
Script 0.13.1 AzureRM.ApplicationInsights.Netcore {Get-AzureRmApplicationInsights, New-AzureRmApplicationInsights, Remove-AzureRmApplicationInsights, Set-AzureRmApplicationInsightsPricingPlan...}
Script 0.13.1 AzureRM.Automation.Netcore {Get-AzureRMAutomationHybridWorkerGroup, Get-AzureRmAutomationJobOutputRecord, Import-AzureRmAutomationDscNodeConfiguration, Export-AzureRmAutomationDscConfiguration...}
Script 0.13.1 AzureRM.Batch.Netcore {Remove-AzureRmBatchAccount, Get-AzureRmBatchAccount, Get-AzureRmBatchAccountKeys, New-AzureRmBatchAccount...}
Script 0.13.1 AzureRM.Billing.Netcore {Get-AzureRmBillingInvoice, Get-AzureRmBillingPeriod, Get-AzureRmEnrollmentAccount}
Script 0.13.1 AzureRM.Cdn.Netcore {Get-AzureRmCdnProfile, Get-AzureRmCdnProfileSsoUrl, New-AzureRmCdnProfile, Remove-AzureRmCdnProfile...}
Script 0.13.1 AzureRM.CognitiveServices.Netcore {Get-AzureRmCognitiveServicesAccount, Get-AzureRmCognitiveServicesAccountKey, Get-AzureRmCognitiveServicesAccountSkus, Get-AzureRmCognitiveServicesAccountUsage...}
Script 0.13.1 AzureRM.Compute.Netcore {Remove-AzureRmAvailabilitySet, Get-AzureRmAvailabilitySet, New-AzureRmAvailabilitySet, Update-AzureRmAvailabilitySet...}
Script 0.13.1 AzureRM.Consumption.Netcore {Get-AzureRmConsumptionBudget, Get-AzureRmConsumptionMarketplace, Get-AzureRmConsumptionPriceSheet, Get-AzureRmConsumptionReservationDetail...}
Script 0.13.1 AzureRM.ContainerInstance.Netcore {New-AzureRmContainerGroup, Get-AzureRmContainerGroup, Remove-AzureRmContainerGroup, Get-AzureRmContainerInstanceLog}
Script 0.13.1 AzureRM.ContainerRegistry.Netcore {New-AzureRmContainerRegistry, Get-AzureRmContainerRegistry, Update-AzureRmContainerRegistry, Remove-AzureRmContainerRegistry...}
Script 0.13.1 AzureRM.DataLakeAnalytics.Netcore {Get-AzureRmDataLakeAnalyticsDataSource, New-AzureRmDataLakeAnalyticsCatalogCredential, Remove-AzureRmDataLakeAnalyticsCatalogCredential, Remove-AzureRmDataLakeAnalyticsCatalogSecret...}
Script 0.13.1 AzureRM.DataLakeStore.Netcore {Get-AzureRmDataLakeStoreTrustedIdProvider, Remove-AzureRmDataLakeStoreTrustedIdProvider, Remove-AzureRmDataLakeStoreFirewallRule, Set-AzureRmDataLakeStoreTrustedIdProvider...}
Script 0.13.1 AzureRM.DevTestLabs.Netcore {Get-AzureRmDtlAllowedVMSizesPolicy, Get-AzureRmDtlAutoShutdownPolicy, Get-AzureRmDtlAutoStartPolicy, Get-AzureRmDtlVMsPerLabPolicy...}
Script 0.13.1 AzureRM.Dns.Netcore {Get-AzureRmDnsRecordSet, New-AzureRmDnsRecordConfig, Remove-AzureRmDnsRecordSet, Set-AzureRmDnsRecordSet...}
Script 0.13.1 AzureRM.EventGrid.Netcore {New-AzureRmEventGridTopic, Get-AzureRmEventGridTopic, Set-AzureRmEventGridTopic, New-AzureRmEventGridTopicKey...}
Script 0.13.1 AzureRM.EventHub.Netcore {New-AzureRmEventHubNamespace, Get-AzureRmEventHubNamespace, Set-AzureRmEventHubNamespace, Remove-AzureRmEventHubNamespace...}
Script 0.13.1 AzureRM.Insights.Netcore {Get-AzureRmMetricDefinition, Get-AzureRmMetric, Remove-AzureRmLogProfile, Get-AzureRmLogProfile...}
Script 0.13.1 AzureRM.IotHub.Netcore {Add-AzureRmIotHubKey, Get-AzureRmIotHubEventHubConsumerGroup, Get-AzureRmIotHubConnectionString, Get-AzureRmIotHubJob...}
Script 0.13.1 AzureRM.KeyVault.Netcore {Add-AzureKeyVaultCertificate, Update-AzureKeyVaultCertificate, Stop-AzureKeyVaultCertificateOperation, Get-AzureKeyVaultCertificateOperation...}
Script 0.13.1 AzureRM.LogicApp.Netcore {Get-AzureRmIntegrationAccountAgreement, Get-AzureRmIntegrationAccountCallbackUrl, Get-AzureRmIntegrationAccountCertificate, Get-AzureRmIntegrationAccount...}
Script 0.13.1 AzureRM.MachineLearning.Netcore {Move-AzureRmMlCommitmentAssociation, Get-AzureRmMlCommitmentAssociation, Get-AzureRmMlCommitmentPlanUsageHistory, Remove-AzureRmMlCommitmentPlan...}
Script 0.13.1 AzureRM.MachineLearningCompute.N... {Get-AzureRmMlOpCluster, Get-AzureRmMlOpClusterKey, Test-AzureRmMlOpClusterSystemServicesUpdateAvailability, Update-AzureRmMlOpClusterSystemService...}
Script 0.13.1 AzureRM.MarketplaceOrdering.Netcore {Get-AzureRmMarketplaceTerms, Set-AzureRmMarketplaceTerms}
Script 0.13.1 AzureRM.Media.Netcore {Sync-AzureRmMediaServiceStorageKeys, Set-AzureRmMediaServiceKey, Get-AzureRmMediaServiceKeys, Get-AzureRmMediaServiceNameAvailability...}
Script 0.13.1 AzureRM.Netcore
Script 0.13.1 AzureRM.Network.Netcore {Add-AzureRmApplicationGatewayAuthenticationCertificate, Get-AzureRmApplicationGatewayAuthenticationCertificate, New-AzureRmApplicationGatewayAuthenticationCertificate, Remove-AzureRmApplicationGatewayAuthenticationCertificate...}
Script 0.13.1 AzureRM.NotificationHubs.Netcore {Get-AzureRmNotificationHub, Get-AzureRmNotificationHubAuthorizationRules, Get-AzureRmNotificationHubListKeys, Get-AzureRmNotificationHubPNSCredentials...}
Script 0.13.1 AzureRM.OperationalInsights.Netcore {New-AzureRmOperationalInsightsAzureActivityLogDataSource, New-AzureRmOperationalInsightsCustomLogDataSource, Disable-AzureRmOperationalInsightsLinuxCustomLogCollection, Disable-AzureRmOperationalInsightsIISLogCollection...}
Script 0.13.1 AzureRM.PolicyInsights.Netcore {Get-AzureRmPolicyEvent, Get-AzureRmPolicyState, Get-AzureRmPolicyStateSummary}
Script 0.13.1 AzureRM.PowerBIEmbedded.Netcore {Remove-AzureRmPowerBIWorkspaceCollection, Get-AzureRmPowerBIWorkspaceCollection, Get-AzureRmPowerBIWorkspaceCollectionAccessKeys, Get-AzureRmPowerBIWorkspace...}
Script 0.13.1 AzureRM.Profile.Netcore {Disable-AzureRmDataCollection, Disable-AzureRmContextAutosave, Enable-AzureRmDataCollection, Enable-AzureRmContextAutosave...}
Script 0.13.1 AzureRM.Relay.Netcore {New-AzureRmRelayNamespace, Get-AzureRmRelayNamespace, Set-AzureRmRelayNamespace, Remove-AzureRmRelayNamespace...}
Script 0.13.1 AzureRM.Resources.Netcore {Get-AzureRmProviderOperation, Remove-AzureRmRoleAssignment, Get-AzureRmRoleAssignment, New-AzureRmRoleAssignment...}
Script 0.13.1 AzureRM.ServiceBus.Netcore {New-AzureRmServiceBusNamespace, Get-AzureRmServiceBusNamespace, Set-AzureRmServiceBusNamespace, Remove-AzureRmServiceBusNamespace...}
Script 0.13.1 AzureRM.ServiceFabric.Netcore {Add-AzureRmServiceFabricApplicationCertificate, Add-AzureRmServiceFabricClientCertificate, Add-AzureRmServiceFabricClusterCertificate, Add-AzureRmServiceFabricNode...}
Script 0.13.1 AzureRM.Sql.Netcore {Get-AzureRmSqlDatabaseTransparentDataEncryption, Get-AzureRmSqlDatabaseTransparentDataEncryptionActivity, Set-AzureRmSqlDatabaseTransparentDataEncryption, Get-AzureRmSqlDatabaseUpgradeHint...}
Script 0.13.1 AzureRM.Storage.Netcore {Get-AzureRmStorageAccount, Get-AzureRmStorageAccountKey, New-AzureRmStorageAccount, New-AzureRmStorageAccountKey...}
Script 0.13.1 AzureRM.StreamAnalytics.Netcore {Get-AzureRmStreamAnalyticsFunction, Get-AzureRmStreamAnalyticsDefaultFunctionDefinition, New-AzureRmStreamAnalyticsFunction, Remove-AzureRmStreamAnalyticsFunction...}
Script 0.13.1 AzureRM.Tags.Netcore {Remove-AzureRmTag, Get-AzureRmTag, New-AzureRmTag}
Script 0.13.1 AzureRM.TrafficManager.Netcore {Disable-AzureRmTrafficManagerEndpoint, Enable-AzureRmTrafficManagerEndpoint, Set-AzureRmTrafficManagerEndpoint, Get-AzureRmTrafficManagerEndpoint...}
Script 0.13.1 AzureRM.UsageAggregates.Netcore Get-UsageAggregates
Script 0.13.1 AzureRM.Websites.Netcore {Get-AzureRmAppServicePlan, Set-AzureRmAppServicePlan, New-AzureRmAppServicePlan, Remove-AzureRmAppServicePlan...}

Directory: /opt/microsoft/powershell/6.0.4/Modules

ModuleType Version Name ExportedCommands
---------- ------- ---- ----------------
Manifest 1.1.0.0 Microsoft.PowerShell.Archive {Compress-Archive, Expand-Archive}
Manifest 3.0.0.0 Microsoft.PowerShell.Host {Start-Transcript, Stop-Transcript}
Manifest 3.1.0.0 Microsoft.PowerShell.Management {Add-Content, Clear-Content, Clear-ItemProperty, Join-Path...}
Manifest 3.0.0.0 Microsoft.PowerShell.Security {Get-Credential, Get-ExecutionPolicy, Set-ExecutionPolicy, ConvertFrom-SecureString...}
Manifest 3.1.0.0 Microsoft.PowerShell.Utility {Format-List, Format-Custom, Format-Table, Format-Wide...}
Script 1.1.7.0 PackageManagement {Find-Package, Get-Package, Get-PackageProvider, Get-PackageSource...}
Script 1.6.0 PowerShellGet {Install-Module, Find-Module, Save-Module, Update-Module...}
Script 0.0 PSDesiredStateConfiguration {Get-MofInstanceName, ValidateNodeManager, Get-InnerMostErrorRecord, Update-ConfigurationErrorCount...}
Script 1.2 PSReadLine {Get-PSReadlineKeyHandler, Set-PSReadlineKeyHandler, Remove-PSReadlineKeyHandler, Get-PSReadlineOption...}

```

### Environment Data
```powershell
$PSVersionTable

Name Value
---- -----
PSVersion 6.0.4
PSEdition Core
GitCommitId v6.0.4
OS Linux 4.16.0-0.bpo.1-amd64 #1 SMP Debian 4.16.5-1~bpo9+1 (2018-05-06)
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0

```

### Debug Output

```
Invoke-AzureRmVMRunCommand -ResourceGroupName "Test_rg" -VMName "TestVM" -CommandId "RunPowerShellScript" -ScriptPath "dummy_script.ps1" -Parameter @{"yourname" = "Max Mustermann The Fifth"} -Verbose
DEBUG: 12:25:51 - InvokeAzureRmVMRunCommand begin processing with ParameterSet 'DefaultParameter'.
DEBUG: 12:25:51 - using account id 'foo.bar@email.com'...
VERBOSE: Performing the operation "Invoke" on target "TestVM".
DEBUG: [Common.Authentication]: Authenticating using Account: 'foo.bar@email.com', environment: 'AzureCloud', tenant: '37451347-e8d2-4458-8077-8cceaab08380'
DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
POST

Absolute Uri:
https://management.azure.com/subscriptions/a8c043c7-88dc-4a14-8c75-0387d1f45cc0/resourceGroups/Test_rg/providers/Microsoft.Compute/virtualMachines/TestVM/runCommand?api-version=2018-04-01

Headers:
x-ms-client-request-id : 20f63285-ca8a-4759-a3bf-c8dd4f79f038
accept-language : en-US

Body:
{
"commandId": "RunPowerShellScript",
"script": [
"param(",
" [String]$yourname",
" )",
"\"Hello $yourname!\" >C:\\blah.log"
],
"parameters": [
{
"name": "yourname",
"value": "Max Mustermann The Fifth"
}
]
}

DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
Accepted

Headers:
Cache-Control : no-cache
Pragma : no-cache
Location : https://management.azure.com/subscriptions/a8c043c7-88dc-4a14-8c75-0387d1f45cc0/providers/Microsoft.Compute/locations/ukwest/operations/6583ef05-d951-43b3-bb8b-d0b5428e3c4c?monitor=true&api-version=2018-04-01
Azure-AsyncOperation : https://management.azure.com/subscriptions/a8c043c7-88dc-4a14-8c75-0387d1f45cc0/providers/Microsoft.Compute/locations/ukwest/operations/6583ef05-d951-43b3-bb8b-d0b5428e3c4c?api-version=2018-04-01
x-ms-ratelimit-remaining-resource: Microsoft.Compute/UpdateVM3Min;239,Microsoft.Compute/UpdateVM30Min;1195
Strict-Transport-Security : max-age=31536000; includeSubDomains
x-ms-served-by : 31fa4520-3ace-413b-9767-4c034cc33923_131781507814555981
x-ms-request-id : 6583ef05-d951-43b3-bb8b-d0b5428e3c4c
Server : Microsoft-HTTPAPI/2.0,Microsoft-HTTPAPI/2.0
x-ms-ratelimit-remaining-subscription-writes: 1198
x-ms-correlation-request-id : bf3d1bfd-905d-493f-a0c0-2b374b2f4775
x-ms-routing-request-id : UKNORTH:20180917T122559Z:bf3d1bfd-905d-493f-a0c0-2b374b2f4775
X-Content-Type-Options : nosniff
Date : Mon, 17 Sep 2018 12:25:59 GMT

Body:

DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://management.azure.com/subscriptions/a8c043c7-88dc-4a14-8c75-0387d1f45cc0/providers/Microsoft.Compute/locations/ukwest/operations/6583ef05-d951-43b3-bb8b-d0b5428e3c4c?api-version=2018-04-01

Headers:

Body:

DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
OK

Headers:
Cache-Control : no-cache
Pragma : no-cache
x-ms-ratelimit-remaining-resource: Microsoft.Compute/GetOperation3Min;14998,Microsoft.Compute/GetOperation30Min;29982
Strict-Transport-Security : max-age=31536000; includeSubDomains
x-ms-served-by : 31fa4520-3ace-413b-9767-4c034cc33923_131781507814555981
x-ms-request-id : a0ce9b65-95fc-4eac-8262-853b79e87b42
Server : Microsoft-HTTPAPI/2.0,Microsoft-HTTPAPI/2.0
x-ms-ratelimit-remaining-subscription-reads: 11996
x-ms-correlation-request-id : dd50410b-bd71-4bb7-be38-f2e653c132d8
x-ms-routing-request-id : UKNORTH:20180917T122630Z:dd50410b-bd71-4bb7-be38-f2e653c132d8
X-Content-Type-Options : nosniff
Date : Mon, 17 Sep 2018 12:26:29 GMT

Body:
{
"startTime": "2018-09-17T12:25:59.8512565+00:00",
"endTime": "2018-09-17T12:26:13.6689291+00:00",
"status": "Succeeded",
"properties": {
"output": {
"value": [
{
"code": "ComponentStatus/StdOut/succeeded",
"level": "Info",
"displayStatus": "Provisioning succeeded",
"message": ""
},
{
"code": "ComponentStatus/StdErr/succeeded",
"level": "Info",
"displayStatus": "Provisioning succeeded",
"message": ""
}
]
}
},
"name": "6583ef05-d951-43b3-bb8b-d0b5428e3c4c"
}

DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://management.azure.com/subscriptions/a8c043c7-88dc-4a14-8c75-0387d1f45cc0/providers/Microsoft.Compute/locations/ukwest/operations/6583ef05-d951-43b3-bb8b-d0b5428e3c4c?monitor=true&api-version=2018-04-01

Headers:

Body:

DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
OK

Headers:
Cache-Control : no-cache
Pragma : no-cache
x-ms-ratelimit-remaining-resource: Microsoft.Compute/GetOperation3Min;14997,Microsoft.Compute/GetOperation30Min;29981
Strict-Transport-Security : max-age=31536000; includeSubDomains
x-ms-served-by : 31fa4520-3ace-413b-9767-4c034cc33923_131781507814555981
x-ms-request-id : 14c4bba8-2be3-4216-a12e-8d05d33dc1b3
Server : Microsoft-HTTPAPI/2.0,Microsoft-HTTPAPI/2.0
x-ms-ratelimit-remaining-subscription-reads: 11995
x-ms-correlation-request-id : 96c12d9b-ea69-460f-9037-ff97cf82f1a8
x-ms-routing-request-id : UKNORTH:20180917T122630Z:96c12d9b-ea69-460f-9037-ff97cf82f1a8
X-Content-Type-Options : nosniff
Date : Mon, 17 Sep 2018 12:26:29 GMT

Body:
{
"value": [
{
"code": "ComponentStatus/StdOut/succeeded",
"level": "Info",
"displayStatus": "Provisioning succeeded",
"message": ""
},
{
"code": "ComponentStatus/StdErr/succeeded",
"level": "Info",
"displayStatus": "Provisioning succeeded",
"message": ""
}
]
}

DEBUG: AzureQoSEvent: CommandName - Invoke-AzureRmVMRunCommand; IsSuccess - True; Duration - 00:00:38.5808246; Exception - ;
DEBUG: Finish sending metric.
DEBUG: 12:26:38 - InvokeAzureRmVMRunCommand end processing.
DEBUG: 12:26:38 - InvokeAzureRmVMRunCommand end processing.

```

Is this a bug, or have I missed something? I have naively tried escaping the spaces with backslashes, which led to the backslashes themselves being output in the target file as well without solving the issue.