Fixes #6543 - updt index on cp event bz1115602

This listens for entitlement events from candlepin and updates the specific
pool index instead of pulling all the subscription information each time
the user accesses the subscriptions page.

New gem dependency added: qpid_messaging
gem has dependency qpid-cpp-client-devel and qpid-cpp-client
rpm packages.
For this and the above, the packages that are listed here are packages that we build in our Koji and thus need to end up in our repos. If they are available in the base OS or through another repo that can be enabled then we don't necessarily need to carry them. @jlsherrill @jmontleo can you look these over from your experience with qpid packages and comment?