Update gloo dependency
Update gloo dependency

Summary:
This includes the commit that adds `close()` to gloo::transport::Pair.
Closes https://github.com/caffe2/caffe2/pull/1127

Reviewed By: akyrola

Differential Revision: D5708513

Pulled By: pietern

fbshipit-source-id: 8ef505d48b3bfa1576c068c4e4a29c9a8ed5efc7

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