Created by: tpatejko

This PR fixes a problem with residual data in NCHW format. The data is not reordered into MKLDNN blocked format, which results in incorrect accuracy values.

The problem was observed in SE-Resnext. In this topology, residual data that comes to MKLDNN convolution is an output from elementwise_mul operator. The data is in NCHW format, so MKLDNN needs to reorder the data into MKLDNN blocked format.