message: Allow TF_CONFIG when remote_cluster is specified in distribute coordinator's utility for estimator.
diff: @@ -147,8 +147,8 @@ def init_run_config(config, tf_config):
  # `experimental_distribute.remote_cluster` is set.
  if (config._train_distribute and config._experimental_distribute and
  config._experimental_distribute.remote_cluster):
  - if tf_config:
  - raise ValueError('Cannot set both TF_CONFIG environment variable and '
  + if cluster_spec:
  + raise ValueError('Cannot set both "cluster_spec" of TF_CONFIG and '
  '`experimental_distribute.remote_cluster`')
  config._distribute_coordinator_mode = dc.CoordinatorMode.STANDALONE_CLIENT
  config._cluster_spec = config._experimental_distribute.remote_cluster
  