Use FQDNs for RabbitMQ's cluster configuration
Use FQDNs for RabbitMQ's cluster configuration

This sets the cluster_nodes configuration in RabbitMQ to use FQDNs
instead of IP addresses. Note that in HA, RabbitMQ is already
configured using FQDNs.

Change-Id: I2b1cec25ff25f4afd72a28246c2cda9c58d7b61e

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo