#1020

[Tensorflow] Fix potential vulnerable cloned function

[Tensorflow] Fix potential vulnerable cloned function

[Tensorflow] Fix potential vulnerable cloned function

[Restore]fix op dependency

[Embedding] Refine the code of exporting EV.

[Embedding] Check the sharded property of tf.train.Saver.

[Embedding] Change the log level for EV restore.

[Rendezvous] RemoteRendezvous supports FlowControl.

[Docs] Fix readthedoc build fail.