message: Added `SqlDataset` to __init.py__ to include `SqlDataset` in the next
  TensorFlow release.
diff: @@ -38,6 +38,7 @@ from tensorflow.contrib.data.python.ops.dataset_ops import group_by_window
  from tensorflow.contrib.data.python.ops.dataset_ops import Iterator
  from tensorflow.contrib.data.python.ops.dataset_ops import read_batch_features
  from tensorflow.contrib.data.python.ops.dataset_ops import rejection_resample
  +from tensorflow.contrib.data.python.ops.dataset_ops import SqlDataset
  from tensorflow.contrib.data.python.ops.dataset_ops import TextLineDataset
  from tensorflow.contrib.data.python.ops.dataset_ops import TFRecordDataset
  from tensorflow.contrib.data.python.ops.sloppy_ops import sloppy_interleave
  