Updated openstack/openstack
Project: openstack/ceilometer  d7eabde418fecd2a4ca511b278abda96fa55644b

Ignore ceilometer.conf

ceilometer.conf will be generated after we run tox -egenconfig, it
should be ignored.

Change-Id: Ia6d88892a7c93cfa880e4383bbefa55c069a12d9