Updated openstack/openstack
Project: openstack/ceilometer  4ed4559f4722249645bd87b5b2abed47710dd068

Ignore the generated file ceilometer.conf.sample

Since we have removed the ceilometer.conf.sample file and added
tox -e genconfig to generate it, we should no longer track it.

Change-Id: I66a03eb2672941ba5115bf0adb9fb0c944f68e4d
Closes-Bug: #1320150