merge to local

* remove workspace_handle in conv2d_cudnn
test=develop

* remove workspace_handle
test=develop

* fix bug
test=develop

* make test_conv2d_op SERIAL
test=develop

* save memory in conv_cudnn
test=develop

* enhance thread safety
test=develop

* enhance temporary allocator
test=develop

* Add excess fraction
test=develop

* follow comments
test=develop

* fix bug and code refine
test=develop

* fix memory size check
test=develop

* rename reuse_tmp_allocation_excess_fraction
test=develop

Refine/seqpool/feed with infer zerocopytensor

* Enable basic MKL-DNN INT8 Conv OP
test=develop

* Modify test case
test=develop

* Clean unittest code
test=develop

* Fix test
test=develop

* Modify test
test=develop

* Enable MKL-DNN INT8 Conv with Relu Fusion OP
test=develop

* Enable INT8 Conv with residual fusion OP
test=develop

* Modify code.
test=develop

* Modify basic INT8 Conv
test=develop

* Modify Conv.
test=develop

* fix style
test=develop

* Fix style
test=develop

* Fix test
test=develop

* Modify code.
test=develop

* Fix test
test=develop

remove the dismatch enclosure to avoid warning message test=develop

test=develop

* clip softmax for fp16

* updates

* fuse xent support fp16 test=develop

* wip

* wip

* add simple row reduce

* wip fp16 accurate softmax

* add accurate softmax kernel for fp16 test=develop

* update test=develop

* fix cpu build test=develop

* update api.spec test=develop

* follow comments test=develop

* fix build test=develop

* fix trt build test=develop

* fix inference build test=develop

* fix merge test=develop

* update test=develop

* try fix build test=develop

* fix build test=develop

* rename real_exp test=develop

* fortest

* remove hacky kernels test=develop

* clean up test=develop

test=develop

test=develop

Set correct TBB library name in debug build 

test=develop

reduce threads number to avoid analyzer_rnn1_tester hang in CI

fix demo ci bug

Enforce dim check in data feeder

fix dist sparse l2 decay

Set correct TBB library name in debug build and remove warning related to rpath dependency from symlink.
test=develop

test=develop

Fix ngraph cmake warning 

test=develop

Fuse/seqpool concat 2

1. trt_demo bug
2. trigger exit when exists a bug

test=develop

fix analyzer_test runs error in native_config

test=develop

try unify Executor and ParallelExecutor

test=develop

test=develop

test=develop

use the new MKLDNN repo url

test=develop

test=develop

refine seqpool op