* Adjust mkldnn_placement_pass to check library type and data type

* Check if var has inputs

* Remove unrelated test

* Refactor

* Add a interface to enable cudnn for inference.

* Add cudnn_placement_pass.
test=develop

* Set the default value of cudnn_enabled_op_types to null.
test=develop

* Write the common basic class, placement_pass_base, to refine the codes.
test=develop

* Call EnableCUDNN in unittest.
test=develop

* Refine cudnn_placement_pass tester.

* Enable the testing of cudnn_placement_pass in inference's unittest.
test=develop

* Add the check of op kernels.
test=develop

Async exe support communicator

* cpplint test and add tesnor_py_test.cc

* Update

* Update

* add NDEBUG switch to PADDLE_ENFORCE

* Free will be added soon