Update pbr to new release 3.0.1
Update pbr to new release 3.0.1

Change-Id: I27a8afa1532658ec903c6ee14c7c714bdfc2e30e
Depends-On: I6186294f94c04b6bcab2c4224d599e2f1290ad46

openstack/rpm-packaging,openstack/rpm-packaging