BZ #1120288 - Avoid race condition in rabbitmq clustering.

https://bugzilla.redhat.com/show_bug.cgi?id=1120288

RabbitMQ will now start first on the VIP node and then the others,
similar to other HA services.
Merge pull request #318 from jeckersb/rabbitmq_prevent_race

avoid race condition in rabbitmq clustering (bz1120288)