SSL for communication between keystone and rabbitmq

Currently, Keystone can not be configured via Puppet to communicate with
rabbitmq using SSL. Most other puppet component already have this feature.
This commit enable this feature for Keystone.

Change-Id: Idd207a58a71c001e581d17c5b97965189e20869f
Merge git://github.com/puppetlabs/puppetlabs-keystone