* Support dynamic scales for Qconv's and Dequantize

* Remove constant folding

* add additional dynamic_quantize unittest

* add another mxnet quantize unittest

* add additional dynamic_dequantize tests

* fix shape error

* add dynamic signed_quantize unittest

* Pass correct scale

* Refactoring

* Added dynamic scale support for QCBA and QCBSA

* Refactor to create MKLDNN primitives on the first iteration

* remove stray code

* unused variables

* remove extraneous line