brew.concat: don't set both order and axis
brew.concat: don't set both order and axis

Summary:
Was https://github.com/caffe2/caffe2/pull/1151.

pooyadavoodi says this was causing problems for him. I don't remember the details.
Closes https://github.com/caffe2/caffe2/pull/1184

Differential Revision: D5794711

Pulled By: akyrola

fbshipit-source-id: 4d75f2a9b30881ba662141c352ac556cb5d3cce6

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