message: Add FixedLengthRecordDatasetV2 to the reader list of tf.contrib.distribute
  so that tf.contrib.distribute's input_op could correctly locate the Dataset
diff: @@ -29,7 +29,8 @@ from tensorflow.python.platform import tf_logging
  _READER_DATASET_OPS = [
  "TextLineDataset",
  "TFRecordDataset",
  - "FixedLengthRecordDataset"
  + "FixedLengthRecordDataset",
  + "FixedLengthRecordDatasetV2"
  ]
  