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
Merge pull request #390 from rcritten/rabbit_ssl

BZ #1084229 - Add support for configuring SSL for RabbitMQ