message: VMSS: exposing the `requireGuestProvisionSignal` field for `2019-03-01`
diff: "allowExtensionOperations": {
  "type": "boolean",
  "description": "Specifies whether extension operations should be allowed on the virtual machine. <br><br>This may only be set to False when no extensions are present on the virtual machine."
  + },
  + "requireGuestProvisionSignal": {
  + "type": "boolean",
  + "description": "Specifies whether the guest provision signal is required from the virtual machine."
  }
  },
  "description": "Specifies the operating system settings for the virtual machine."
  