Updated openstack/openstack
Project: openstack/ceilometer  831c3038155428c6338bf31c829ce02d1f393af7

Fix E251 violations and re-enable gating

E251 got stricter in hacking 0.9, so fix new violations and
re-enable gating.

Change-Id: Idbc0a85d6204f5707d17f4bfd4d98199c1edb333