Comment 13 for bug 1274947

To clarify: comment #12 was for clustered rabbitmq (as already reported
above), FYI trying to force the charm to use plain IPs instead of hostnames
(recall that other units need to be able to refer to each other as
e.g.. rabbit@$OTHER_HOST) fails with e.g.:

2014-10-16 18:51:13 INFO config-changed nodes in question: ['rabbit@10.1.57.62']
2014-10-16 18:51:13 INFO config-changed =ERROR REPORT==== 16-Oct-2014::18:51:13 ===
2014-10-16 18:51:13 INFO config-changed ** System NOT running to use fully qualified hostnames **
2014-10-16 18:51:13 INFO config-changed ** Hostname 10.1.57.62 is illegal **