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.
@ehelms updated with all the changes. I'm still getting a failing jenkins run because bundle can't install qpid-messaging gem w/o qpid-cpp-client-devel being installed. Does jenkins look at the comps or do we have to manually update the jenkins?