Updated openstack/openstack

Project: openstack/keystonemiddleware  a2e3d60644aadb4ecb3d49dadbcd5d4c1dec2176

Remove old comment referencing fixed bug

There was an old comment left regarding this bug:

https://bugs.launchpad.net/pbr/+bug/1260495

which was fixed over a year ago but left over.

This change removes the comment and related extension
and adds the referenced pbr setting.

Change-Id: Ib334c136835a9b5b43cabe13b9616cce45e578e0