[Rabbitmq] allow non-localhost connections to 'guest' user

From fedora 22+ rabbitmq is less permissive on guest user,
we have to allow access on this user from other hosts.

Change-Id: Ic94d97c146b151cde11bcc62e1ce14703b433053
Resolves: rhbz#1175428
(cherry picked from commit c3828202e73e2fe3063f25ca267f38b297ab933d)
Merge "[Rabbitmq] allow non-localhost connections to 'guest' user" into juno