* Create mkldnn primitives at first iteration for CODEGEN.

 OPs: add, lstm, and rnn.

*  OPs: batchnorm.

*  OPs: concat and lrn.

Remove dead code.

* Skip in place concat, relu, reshape, and slice when building node_primitive_string_deps_index map.

* Change NGRAPH_ASSERT to NGRAPH_CHECK.

* Ops: Qconv

* Ops: Convs

* Address PR Feedback.

* Dynamic scale support for qconvs

* updating to amy's recent change

* GroupConv and Cleaning dead code

* Address PR Feedback.

* Remove unused variable.

* Fix a bug.

* Fix style error.