BZ#1122314 - RabbitMQ clustering fails depending on which node has the VIP

https://bugzilla.redhat.com/show_bug.cgi?id=1122314

See the large comment in the patch for a thorough explanation.
Merge pull request #326 from jeckersb/rabbit_cluster_ordering

BZ#1122314 - RabbitMQ clustering fails depending on which node has the VIP