BZ #1084229 - Add support for configuring SSL for RabbitMQ

https://bugzilla.redhat.com/show_bug.cgi?id=1084229

Pass the value of $ssl as rabbit_use_ssl to the nova and cinder
services

This relies on o-p-m pulling in fixes for puppet-ceilometer and puppet-neutron to drop the requirement for kombu certificates when SSL in rabbit is enabled. See BZ for blocking bugs.