Setup the Qpid access for ceilometer on RHEL

The default setting for rpc_backend is the kombu implementation, we need
to make sure that qpid is used on RHEL-like systems.

Change-Id: Ifef49622ad9043072a0cd9c102a9afcba305ec66
Closes-Bug: #1317502
Merge "Setup the Qpid access for ceilometer on RHEL"