Update RabbitMQ
Update RabbitMQ

Rebuild latest from Fedora 28, in Rocky first but should push
the update in all active RDO releases including Ocata for RDO Cloud.

NB Fedora rebuilds on EL7 will not work after
https://src.fedoraproject.org/rpms/rabbitmq-server/c/73a848d60be95423ddf807d4a782f52c833be552?branch=master
which introduces dependency on python-unversioned-command available only
in Fedora >= 29.

Change-Id: I7452a47060eaeea0cfb3c05dde52d0f27e6eb8a0

redhat-openstack/rdoinfo,javierpena/rdoinfo