* MKLDNN residual connection fuse: conv op reused

test=develop

* MKLDNN residual connection fuse: added prints for checking fuse

test=develop

* MKLDNN residual connection fuse: add more prints

test=develop

* MKLDNN residual connection fuse: add hash function. test=develop

* MKLDNN residual connection fuse: add hash to elementwise_add

test=develop

* MKLDNN residual connection fuse: add more hashes. test=develop

* MKLDNN residual connection fuse: added hashes to relu

test=develop

* MKLDNN residual connection fuse: do not fuse when fuse_relu is on

* MKLDNN residual connection fuse: check if fuse_relu attribute is set

test=develop

* MKLDNN residual connection fuse: comment out some printouts

* MKLDNN residual connection fuse: remove unused functions in the pass code

* MKLDNN residual connection fuse: delete commented hashes and printouts

* MKLDNN residual connection fuse: remove unnecessary includes. test=develop