Set-AzApiManagementProperty Secret parameter is bool, but New-AzApiManagementProperty Secret parameter is switch

## Description
The parameter -Secret on Set-AzApiManagementProperty is a bool, but the parameter -Secret on New-AzApiManagementProperty is a switch.
These parameters should be the same type, and should probably both be switches.

## Steps to reproduce

```powershell
PS Azure:\> Set-AzApiManagementProperty -Context $context -Name $name -Value $value -Secret
Set-AzApiManagementProperty : Missing an argument for parameter 'Secret'. Specify a parameter of type 'System.Nullable`1[System.Boolean]' and try again.
At line:1 char:73
+ ... anagementProperty -Context $context -Name $name -Value $value -Secret
+ ~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Set-AzApiManagementProperty], ParameterBindingException
+ FullyQualifiedErrorId : MissingArgument,Microsoft.Azure.Commands.ApiManagement.ServiceManagement.Commands.SetAzureApiManagementProperty

```

## Environment data

Name Value
---- -----
PSVersion 6.1.3
PSEdition Core
GitCommitId 6.1.3
OS Linux 4.15.0-1040-azure #44-Ubuntu SMP Thu Feb 21 14:24:01 UTC 2019
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0

## Module versions

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

ModuleType Version Name PSEdition ExportedCommands
---------- ------- ---- --------- ----------------
Script 1.4.0 Az.Accounts Core,Desk {Disable-AzDataCollection, Disable-AzContextAutosave, Enable-AzDataCollection, Enable-AzContextAutosave...}
Script 1.0.1 Az.Aks Core,Desk {Get-AzAks, New-AzAks, Remove-AzAks, Import-AzAksCredential...}
Script 1.0.2 Az.AnalysisServices Core,Desk {Resume-AzAnalysisServicesServer, Suspend-AzAnalysisServicesServer, Get-AzAnalysisServicesServer, Remove-AzAnalysisServicesServer...}
Script 1.0.0 Az.ApiManagement Core,Desk {Add-AzApiManagementRegion, Get-AzApiManagementSsoToken, New-AzApiManagementCustomHostnameConfiguration, New-AzApiManagementSystemCertifica...
Script 1.0.0 Az.ApplicationInsights Core,Desk {Get-AzApplicationInsights, New-AzApplicationInsights, Remove-AzApplicationInsights, Set-AzApplicationInsightsPricingPlan...}
Script 1.1.2 Az.Automation Core,Desk {Get-AzAutomationHybridWorkerGroup, Remove-AzAutomationHybridWorkerGroup, Get-AzAutomationJobOutputRecord, Import-AzAutomationDscNodeConfig...
Script 1.0.0 Az.Batch Core,Desk {Remove-AzBatchAccount, Get-AzBatchAccount, Get-AzBatchAccountKeys, New-AzBatchAccount...}
Script 1.0.0 Az.Billing Core,Desk {Get-AzBillingInvoice, Get-AzBillingPeriod, Get-AzEnrollmentAccount, Get-AzConsumptionBudget...}
Script 1.1.0 Az.Cdn Core,Desk {Get-AzCdnProfile, Get-AzCdnProfileSsoUrl, New-AzCdnProfile, Remove-AzCdnProfile...}
Script 1.0.1 Az.CognitiveServices Core,Desk {Get-AzCognitiveServicesAccount, Get-AzCognitiveServicesAccountKey, Get-AzCognitiveServicesAccountSkus, Get-AzCognitiveServicesAccountType...}
Script 1.5.0 Az.Compute Core,Desk {Remove-AzAvailabilitySet, Get-AzAvailabilitySet, New-AzAvailabilitySet, Update-AzAvailabilitySet...}
Script 1.0.0 Az.ContainerInstance Core,Desk {New-AzContainerGroup, Get-AzContainerGroup, Remove-AzContainerGroup, Get-AzContainerInstanceLog}
Script 1.0.1 Az.ContainerRegistry Core,Desk {New-AzContainerRegistry, Get-AzContainerRegistry, Update-AzContainerRegistry, Remove-AzContainerRegistry...}
Script 1.0.2 Az.DataFactory Core,Desk {Set-AzDataFactoryV2, Update-AzDataFactoryV2, Get-AzDataFactoryV2, Remove-AzDataFactoryV2...}
Script 1.0.0 Az.DataLakeAnalytics Core,Desk {Get-AzDataLakeAnalyticsDataSource, New-AzDataLakeAnalyticsCatalogCredential, Remove-AzDataLakeAnalyticsCatalogCredential, Set-AzDataLakeAn...
Script 1.1.0 Az.DataLakeStore Core,Desk {Get-AzDataLakeStoreTrustedIdProvider, Remove-AzDataLakeStoreTrustedIdProvider, Remove-AzDataLakeStoreFirewallRule, Set-AzDataLakeStoreTrus...
Script 1.0.0 Az.DevTestLabs Core,Desk {Get-AzDtlAllowedVMSizesPolicy, Get-AzDtlAutoShutdownPolicy, Get-AzDtlAutoStartPolicy, Get-AzDtlVMsPerLabPolicy...}
Script 1.0.0 Az.Dns Core,Desk {Get-AzDnsRecordSet, New-AzDnsRecordConfig, Remove-AzDnsRecordSet, Set-AzDnsRecordSet...}
Script 1.1.0 Az.EventGrid Core,Desk {New-AzEventGridTopic, Get-AzEventGridTopic, Set-AzEventGridTopic, New-AzEventGridTopicKey...}
Script 1.0.1 Az.EventHub Core,Desk {New-AzEventHubNamespace, Get-AzEventHubNamespace, Set-AzEventHubNamespace, Remove-AzEventHubNamespace...}
Script 1.0.0 Az.HDInsight Core,Desk {Get-AzHDInsightJob, New-AzHDInsightSqoopJobDefinition, Wait-AzHDInsightJob, New-AzHDInsightStreamingMapReduceJobDefinition...}
Script 1.0.2 Az.IotHub Core,Desk {Add-AzIotHubKey, Get-AzIotHubEventHubConsumerGroup, Get-AzIotHubConnectionString, Get-AzIotHubJob...}
Script 1.0.2 Az.KeyVault Core,Desk {Add-AzKeyVaultCertificate, Update-AzKeyVaultCertificate, Stop-AzKeyVaultCertificateOperation, Get-AzKeyVaultCertificateOperation...}
Script 1.2.1 Az.LogicApp Core,Desk {Get-AzIntegrationAccountAgreement, Get-AzIntegrationAccountAssembly, Get-AzIntegrationAccountBatchConfiguration, Get-AzIntegrationAccountC...
Script 1.0.0 Az.MachineLearning Core,Desk {Move-AzMlCommitmentAssociation, Get-AzMlCommitmentAssociation, Get-AzMlCommitmentPlanUsageHistory, Remove-AzMlCommitmentPlan...}
Script 1.0.0 Az.MarketplaceOrdering Core,Desk {Get-AzMarketplaceTerms, Set-AzMarketplaceTerms}
Script 1.0.0 Az.Media Core,Desk {Sync-AzMediaServiceStorageKeys, Set-AzMediaServiceKey, Get-AzMediaServiceKeys, Get-AzMediaServiceNameAvailability...}
Script 1.0.1 Az.Monitor Core,Desk {Get-AzMetricDefinition, Get-AzMetric, Remove-AzLogProfile, Get-AzLogProfile...}
Script 1.3.0 Az.Network Core,Desk {Add-AzApplicationGatewayAuthenticationCertificate, Get-AzApplicationGatewayAuthenticationCertificate, New-AzApplicationGatewayAuthenticati...
Script 1.0.0 Az.NotificationHubs Core,Desk {Get-AzNotificationHub, Get-AzNotificationHubAuthorizationRules, Get-AzNotificationHubListKeys, Get-AzNotificationHubPNSCredentials...}
Script 1.1.0 Az.OperationalInsights Core,Desk {New-AzOperationalInsightsAzureActivityLogDataSource, New-AzOperationalInsightsCustomLogDataSource, Disable-AzOperationalInsightsLinuxCusto...
Script 1.0.0 Az.PolicyInsights Core,Desk {Get-AzPolicyEvent, Get-AzPolicyState, Get-AzPolicyStateSummary, Get-AzPolicyRemediation...}
Script 1.0.0 Az.PowerBIEmbedded Core,Desk {Remove-AzPowerBIWorkspaceCollection, Get-AzPowerBIWorkspaceCollection, Get-AzPowerBIWorkspaceCollectionAccessKeys, Get-AzPowerBIWorkspace...}
Script 1.1.0 Az.RecoveryServices Core,Desk {Get-AzRecoveryServicesBackupProperty, Get-AzRecoveryServicesVault, Get-AzRecoveryServicesVaultSettingsFile, New-AzRecoveryServicesVault...}
Script 1.0.0 Az.RedisCache Core,Desk {Remove-AzRedisCachePatchSchedule, New-AzRedisCacheScheduleEntry, Get-AzRedisCachePatchSchedule, New-AzRedisCachePatchSchedule...}
Script 1.0.0 Az.Relay Core,Desk {New-AzRelayNamespace, Get-AzRelayNamespace, Set-AzRelayNamespace, Remove-AzRelayNamespace...}
Script 1.2.0 Az.Resources Core,Desk {Get-AzProviderOperation, Remove-AzRoleAssignment, Get-AzRoleAssignment, New-AzRoleAssignment...}
Script 1.0.0 Az.ServiceBus Core,Desk {New-AzServiceBusNamespace, Get-AzServiceBusNamespace, Set-AzServiceBusNamespace, Remove-AzServiceBusNamespace...}
Script 1.0.1 Az.ServiceFabric Core,Desk {Add-AzServiceFabricApplicationCertificate, Add-AzServiceFabricClientCertificate, Add-AzServiceFabricClusterCertificate, Add-AzServiceFabri...
Script 1.0.2 Az.SignalR Core,Desk {New-AzSignalR, Get-AzSignalR, Get-AzSignalRKey, New-AzSignalRKey...}
Script 1.5.0 Az.Sql Core,Desk {Get-AzSqlDatabaseTransparentDataEncryption, Get-AzSqlDatabaseTransparentDataEncryptionActivity, Set-AzSqlDatabaseTransparentDataEncryption...
Script 1.0.3 Az.Storage Core,Desk {Get-AzStorageAccount, Get-AzStorageAccountKey, New-AzStorageAccount, New-AzStorageAccountKey...}
Script 1.0.0 Az.StreamAnalytics Core,Desk {Get-AzStreamAnalyticsFunction, Get-AzStreamAnalyticsDefaultFunctionDefinition, New-AzStreamAnalyticsFunction, Remove-AzStreamAnalyticsFunc...
Script 1.0.1 Az.TrafficManager Core,Desk {Add-AzTrafficManagerCustomHeaderToEndpoint, Remove-AzTrafficManagerCustomHeaderFromEndpoint, Add-AzTrafficManagerCustomHeaderToProfile, Re...
Script 1.1.1 Az.Websites Core,Desk {Get-AzAppServicePlan, Set-AzAppServicePlan, New-AzAppServicePlan, Remove-AzAppServicePl
```

## Debug output

```
DEBUG: >> MakePath([Az.ApiManagement, Set-AzApiManagementProperty])
DEBUG: << MakePath([Az.ApiManagement, Set-AzApiManagementProperty])
```

## Error output

```
DEBUG: >> MakePath([Az.Accounts, Resolve-AzError])
DEBUG: << MakePath([Az.Accounts, Resolve-AzError])
DEBUG: 8:56:02 PM - ResolveError begin processing with ParameterSet 'AnyErrorParameterSet'.
DEBUG: 8:56:02 PM - using account id 'MSI@50342'...

HistoryId: 13

Message : Missing an argument for parameter 'Secret'. Specify a parameter of type 'System.Nullable`1[System.Boolean]' and try again.
StackTrace : at System.Management.Automation.ParameterBinderController.ReparseUnboundArguments()
at System.Management.Automation.CmdletParameterBinderController.BindCommandLineParametersNoValidation(Collection`1 arguments)
at System.Management.Automation.CmdletParameterBinderController.BindCommandLineParameters(Collection`1 arguments)
at System.Management.Automation.CommandProcessor.BindCommandLineParameters()
at System.Management.Automation.CommandProcessor.Prepare(IDictionary psDefaultParameterValues)
at System.Management.Automation.CommandProcessorBase.DoPrepare(IDictionary psDefaultParameterValues)
at System.Management.Automation.Internal.PipelineProcessor.Start(Boolean incomingStream)
at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input)
--- End of stack trace from previous location where exception was thrown ---
at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input)
at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts,
CommandRedirection[][] commandRedirections, FunctionContext funcContext)
at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
Exception : System.Management.Automation.ParameterBindingException
InvocationInfo : {Set-AzApiManagementProperty}
Line : Set-AzApiManagementProperty -Context $context -Name $name -Value $value -Secret
Position : At line:1 char:73
+ ... anagementProperty -Context $context -Name $name -Value $value -Secret
+ ~~~~~~~
DEBUG: AzureQoSEvent: CommandName - Resolve-AzError; IsSuccess - True; Duration - 00:00:00.0674425; Exception - ;
DEBUG: Finish sending metric.
DEBUG: 8:56:02 PM - ResolveError end processing.
DEBUG: 8:56:02 PM - ResolveError end processing.

```