Add use_syslog_rfc_format for neutron and ceilometer

After syncing upstream manifests, this option was lost.
This is necessary for rsyslog to aggregate service logs
on upstream rsyslog server.

Change-Id: Ie2970ac9b526f3877f3c915b08f4a641c9dcb37f
Closes-Bug: #1388111
Merge "Add use_syslog_rfc_format for neutron and ceilometer"