remove import_array() help and use import_array1
remove import_array() help and use import_array1

Summary:
TSIA. See

https://github.com/numpy/numpy/blob/master/numpy/core/code_generators/generate_numpy_api.py

Reviewed By: jamorton

Differential Revision: D4893002

fbshipit-source-id: 4b6bee1bdf8ae905e4c0952a3e8bbbacd4129a50

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