message: Add to seekable, based on review comment
diff: @@ -246,6 +246,7 @@ class FileIO(object):
  pywrap_tensorflow.Set_TF_Status_from_Status(status, ret_status)
  self._writable_file = None
  + @property
  def seekable(self):
  """Returns True as FileIO supports random access ops of seek()/tell()"""
  return True
  