Updated openstack/openstack
Project: openstack/ceilometer  54b3204c47539125e796cf26e381bdd03f313365

Update doc for sample config file issue

Since we have removed the ceilometer.conf.sample file, we should
update the documentation too.

Change-Id: I93ff8bf2f3332d15495d45a5e55e6252da639302
Closes-Bug: #1320761