Remove references to cnmem
Remove references to cnmem

Summary: TSIA

Reviewed By: Yangqing

Differential Revision: D5815624

fbshipit-source-id: 1a6c0e471eac778aeac80001eac947178fc105ed

xzturn/caffe2,pietern/caffe2,sf-wind/caffe2,Yangqing/caffe2,pietern/caffe2,xzturn/caffe2,Yangqing/caffe2,sf-wind/caffe2,pietern/caffe2,sf-wind/caffe2,Yangqing/caffe2,xzturn/caffe2,sf-wind/caffe2,pietern/caffe2,xzturn/caffe2,davinwang/caffe2,Yangqing/caffe2,caffe2/caffe2,davinwang/caffe2,davinwang/caffe2,sf-wind/caffe2,Yangqing/caffe2,davinwang/caffe2,davinwang/caffe2,pietern/caffe2,xzturn/caffe2