message: added primary flag to the NetworkInterfaceIPConfigurationPropertiesFormat object of networkInterface.json definition of Network 2015-06-15 spec
diff: "subnet": {
  "$ref": "./virtualNetwork.json#/definitions/Subnet"
  },
  + "primary": {
  + "type": "boolean",
  + "description": "Gets whether this is a primary customer address on the network interface."
  + },
  "publicIPAddress": {
  "$ref": "./publicIpAddress.json#/definitions/PublicIPAddress"
  },
  