Comment 3 for bug 1495133

For release notes:

All corosync managed services (RabbitMQ, neutron agents, MySQL, etc) are installed with an override file in /etc/init/SERVICENAME.overide. This blocks upstart from starting this service automatically, but it does not prohibit a user from manually running /etc/init.d/SERVICENAME start. Blocking this could be possible with some workarounds, but an administrator could start a duplicate copy of the service through many methods. There should be no scenario where services run duplicate instances, so this solution in place is adequate.