Updated openstack/openstack
Project: openstack/taskflow  e4810f0d3129a07d116f21136fe8f504fb922b1c

Remove pbr as a runtime dependency

The pbr package is only a build time
dependency and as such should not be
in the requirements.txt requirements
file.

Change-Id: I5ee90767850c2caa4534f69b967f6dce6eca0de1