message: Add priority to VM Scale Set VM profile.
diff: "licenseType": {
  "type": "string",
  "description": "Specifies that the image or disk that is being used was licensed on-premises. This element is only used for images that contain the Windows Server operating system. <br><br> Possible values are: <br><br> Windows_Client <br><br> Windows_Server <br><br> If this element is included in a request for an update, the value must match the initial value. This value cannot be updated. <br><br> For more information, see [Azure Hybrid Use Benefit for Windows Server](https://docs.microsoft.com/azure/virtual-machines/virtual-machines-windows-hybrid-use-benefit-licensing?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) <br><br> Minimum api-version: 2015-06-15"
  + },
  + "priority": {
  + "type": "string",
  + "description": "Specifies the priority for the virtual machines in the scale set. <br><br>Minimum api-version: 2017-10-30-preview",
  + "enum": [
  + "Regular",
  + "Low"
  + ],
  + "x-ms-enum": {
  + "name": "VirtualMachinePriorityTypes",
  + "modelAsString": true
  + }
  }
  },
  "description": "Describes a virtual machine scale set virtual machine profile."
  