message: Add hyperVGeneration enum property to ImageProperties
  * added hyperV property along with hyperVGenerationType
  * Updated Compute.json by chaging HyperVGenerationTypes to V1,v2
  * Update compute.json
  * Update compute.json to link enum to outer HyperVGeneration
  * Update compute.json
  Ad trailing ,
diff: },
  "description": "Describes the properties of a Compute Operation Value Display."
  },
  + "HyperVGenerationType": {
  + "type": "string",
  + "description": "Specifies the HyperVGeneration Type for the Virtual Machine created from the image",
  + "enum": [
  + "V1",
  + "V2"
  + ],
  + "x-ms-enum": {
  + "name": "HyperVGenerationTypes",
  + "modelAsString": true
  + }
  + },
  "InstanceViewStatus": {
  "properties": {
  "code": {
  "readOnly": true,
  "type": "string",
  "description": "The provisioning state."
  + },
  + "hyperVGeneration": {
  + "$ref": "#/definitions/HyperVGenerationType",
  + "description": "Gets the HyperVGenerationType of the VirtualMachine created from the image"
  }
  },
  "description": "Describes the properties of an Image."
  