Switch Pulp to using Qpid as the Celery Broker

This pull request applies a patch to kombu 3.0.12 that adds the Qpid broker as a transport option to Kombu and enables the use of that transport through the broker string set in server.conf.

The Qpid transport is feature complete and has been tested with Kombu, Celery, and Pulp

To test: ensure that the broker string starting with qpid:// is being used, restart all pulp units and apache, and run do some repo syncs etc...