[C2 OSS][GPU]exposing totalGlobalMem info to workspace python
[C2 OSS][GPU]exposing totalGlobalMem info to workspace python

exposing totalGlobalMem info to GetDeviceProperties method so that users
can have better understanding

Yangqing/caffe2,Yangqing/caffe2,xzturn/caffe2,Yangqing/caffe2,Yangqing/caffe2,xzturn/caffe2,Yangqing/caffe2,xzturn/caffe2,xzturn/caffe2,xzturn/caffe2,caffe2/caffe2