I built a 3 controller setup and noticed that rabbitmq was not
clustering correctly. Upon closer inspection, the issue was due to the
default cluster name of 'rpc' being found in a cluster_status due to
my hosts have a hostname of rpc-controller-X. This change is more
specific in what we search for in the cluster_status output so we do
not get false positive backs from the cluster name being reflected in
the container hostnames.
Closes #256
f9b4d30186