Bump pbr version to match global requirement
Bump pbr version to match global requirement

Change-Id: I5ef03f8786df980f71ad0873e70b4edbc7ac2872
Closes-Bug: #1488339

openstack/senlin-dashboard,stackforge/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard,openstack/senlin-dashboard