Add Xenial to operatingsystemrelease
Add Xenial to operatingsystemrelease

Change-Id: I604aa05c89b756b5b238afcfdb4f9e4f34d37f6a

fuel-infra/puppet-ceph,stackforge/puppet-ceph,norcams/puppet-ceph,openstack/puppet-ceph,openstack/puppet-ceph,norcams/puppet-ceph,cloudbuy/puppet-ceph,fuel-infra/puppet-ceph,cloudbuy/puppet-ceph