message: [DataFactory]Add CompressionCodec property for ORC Dataset
diff: "location": {
  "$ref": "#/definitions/DatasetLocation",
  "description": "The location of the ORC data storage."
  + },
  + "orcCompressionCodec": {
  + "type": "string",
  + "enum": [
  + "none",
  + "zlib",
  + "snappy"
  + ],
  + "x-ms-enum": {
  + "name": "orcCompressionCodec",
  + "modelAsString": true
  + }
  }
  },
  "required": [
  