* Fix bug introduced by #2238 on r0.15 (#2515)

* Fix bug introduced by #2238

* style

* Avijit/add diag 4 distributed debugging (#2523)

* Fix bug introduced by #2238

* Added a debug logging macro: NGRAPH_DIST_DEBUG which prints the timestamp and MPI rank for distributed AllReduceops

* Fixed code formatting.

* Moved the logging implementation to log.cpp

* Fixed clang warning

* Don't use namespace in header

* Fix ifdef

* disable warning

* Fix files that had missing headers (#2539) (#2541)

* Update mkl-dnn to v0.18. (#2543)

* Update mkl-dnn to v0.18.

* Update mkl-dnn patch file.

* Fixed Centos build issues (gcc 4.8.5 doesn't implement std::put_time - hence the issue). Also fixed a logical error in the distributed setup for unit tests (#2545)

* Migrate Klocwork issues (#2557)

* Migrate Klocwork fixes

* change to kick off another build

* Fix crash by correcting index (#2561)

* Update build script to fix Windows build issues and add some work tow… (#2531)

* Update build script to fix Windows build issues and add some work towards making codegen work on Windows.

* Use "git apply" instead of "patch". (#2532)

Enable using pre-installed MKLDNN on Window.

* Remove commented out lines.