message: Fixes str/bytes error with iterator_ops_test that made it fail while using python3.
diff: @@ -487,7 +487,7 @@ class IteratorTest(test.TestCase):
  iterator_3_handle = iterator_3.string_handle()
  def _encode_raw(byte_array):
  - return "".join([chr(item) for item in byte_array])
  + return bytes(bytearray(byte_array))
  @function.Defun(dtypes.uint8)
  def _remote_fn(h):
  