message: Updating Blueprint spec to include resource group tags
diff: "type": "string",
  "description": "Name of peer artifact."
  }
  + },
  + "tags": {
  + "description": "Tags to be assigned to this resource group.",
  + "$ref": "#/definitions/ResourceGroupTagCollection"
  + }
  }
  + },
  + "ResourceGroupTagCollection": {
  + "description": "A dictionary of resource group tag values.",
  + "type": "object",
  + "properties": {},
  + "additionalProperties": {
  + "type": "string"
  }
  },
  "ParameterDefinitionMetadata": {
  