message: Allow tfe.set_server_def to enable remote eager execution.
  Allows a change any time within process.
diff: EXPERIMENTAL: APIs here are unstable and likely to change without notice.
  -To use, at program startup, call `tfe.enable_eager_execution()`.
  +To use, at program startup, call `tf.enable_eager_execution()`.
  @@metrics
  @@ -67,6 +67,7 @@ To use, at program startup, call `tfe.enable_eager_execution()`.
  @@execution_mode
  @@async_wait
  @@async_clear_error
  +@@set_server_def
  @@run_test_in_graph_and_eager_modes
  @@run_all_tests_in_graph_and_eager_modes
  @@ -110,6 +111,7 @@ from tensorflow.python.eager.context import async_clear_error
  from tensorflow.python.eager.context import SYNC
  from tensorflow.python.eager.context import ASYNC
  from tensorflow.python.eager.context import num_gpus
  +from tensorflow.python.eager.context import set_server_def
  from tensorflow.python.eager.execution_callbacks import add_execution_callback
  from tensorflow.python.eager.execution_callbacks import clear_execution_callbacks
  from tensorflow.python.eager.execution_callbacks import inf_callback
  