message: Add missing import for RNNClassifier
diff: @@ -28,6 +28,7 @@ from tensorflow.contrib.estimator.python.estimator.linear import *
  from tensorflow.contrib.estimator.python.estimator.logit_fns import *
  from tensorflow.contrib.estimator.python.estimator.multi_head import *
  from tensorflow.contrib.estimator.python.estimator.replicate_model_fn import *
  +from tensorflow.contrib.estimator.python.estimator.rnn import *
  from tensorflow.python.util.all_util import remove_undocumented
  # pylint: enable=unused-import,line-too-long,wildcard-import
  