Fixes #6544 - q to receive candlepin events

This creates a queue so that katello can receive candlepin events.
It also sets up the queue's url and address in katello.yml so katello can
connect to the queue. This also adds the Katello user to the qpidd users
group.
Merge pull request #33 from dustint-rh/qpid_katello2

Fixes #6544 - q to receive candlepin events