201-vmss-scale-existing doesn't work anymore.

[201-vmss-scale-existing](https://github.com/Azure/azure-quickstart-templates/tree/master/201-vmss-scale-existing)
### Issue Details

azuredeploy.json seems out of date (for Azure SDK 2.8 at least).

When running .\Deploy-AzureResourceGroup.ps1, I've got the following error message:

New-AzureRmResourceGroupDeployment : 2:02:09 PM - Resource Microsoft.Compute/virtualMachineScaleSets 'myScaleSetName' failed with message
'Required parameter 'properties' is missing (null).'

I had to insert the following into the json file:

"properties": {
"upgradePolicy": {
"mode": "Automatic"
},
"virtualMachineProfile": {
........................

Start with 201-vmss-scale-existing/azuredeploy.json and reproduce the failure using Deploy-AzureResourceGroup.ps1. Inspect the virtual machine scale set definition and its required properties, then validate the template through a deployment. Done means the existing scale-set deployment no longer reports that the properties parameter is missing.

Written by the indexing model from the issue text.