* enable multi datatpye support for Cudnn. refactor binary ops using cudnn

* fix bugs

* add tests to skip list that CUDNN does not support

* not int support on cudnn for backward pooling

* no GPU.dot_4d_5d_multi_axis_big_fp64_VERY_SLOW test anymore

* clang format

* throw if datatype is int8 or int32 for backward pooling

* comments

* fix list in unit_test.manifest

* add type support for alpha, beta

* fix bugs

* datatype support for alpha, beta

* missing ()

* clang format

* batchnorm backward bug fix

* remove debug info

* change member function name to snake case. remove comments

* use nullptr instead of NULL

* code style, use cuDNN everywhere in comments

* add cudnn host parameters memory manager.

* change name to allocate_by_datatype

* compiled

* debug

* fix bug: using list instead of vector, vector address will change each time it resize

* add CUDNN_DATA_UINT8 and CUDNN_DATA_UINT8x4