Updated openstack/openstack
Project: openstack-dev/pbr  a3a875b1a0eee25344d8d6a8898ee176d3dc46b3
null
Prevent ordereddict installation on 2.7

This supports https://review.openstack.org/#/c/48475/ in glance
to remove copy/pasted ordereddict code.

Change-Id: I9b0a2588c6e7da86c048698c5e6dfe37ced4dd7f