https://bugzilla.redhat.com/show_bug.cgi?id=1059028
--- Comment #2 from Ian McLeod imcleod@redhat.com --- Note to anyone following. The devstack installer has a commit that attempts to workaround this issue by retrying the rabbitmq restart:
https://github.com/openstack-dev/devstack/commit/f6c001faf6ac5728e07c6bbdaa6...
Still, it would be nice to sort this out on the rabbitmq side eventually.