message: add compute
diff: "integrationRuntime": {
  "description": "The integration runtime reference.",
  "$ref": "../datafactory.json#/definitions/IntegrationRuntimeReference"
  + },
  + "compute": {
  + "description": "Compute properties for data flow activity.",
  + "type": "object",
  + "properties": {
  + "computeType": {
  + "description": "Compute type of the cluster which will execute data flow job.",
  + "type": "string",
  + "enum": [
  + "General",
  + "MemoryOptimized",
  + "ComputeOptimized"
  + ],
  + "x-ms-enum": {
  + "name": "DataFlowComputeType",
  + "modelAsString": true
  + }
  + },
  + "coreCount": {
  + "description": "Core count of the cluster which will execute data flow job. Supported values are: 8, 16, 32, 48, 80, 144 and 272.",
  + "type": "integer"
  + }
  + }
  }
  },
  "required": [
  