BZ #1131980 - Fix qpid configuration for Neutron Controllers.

https://bugzilla.redhat.com/show_bug.cgi?id=1131980

The amqp_provider was not being set in all needed places, causing qpid
to not be installed, and rabbit to still be installed.
Merge pull request #380 from jguiditta/BZ1131980-neutron-qpid

BZ #1131980 - Fix qpid configuration for Neutron Controllers.