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.
If Jenkins requires a package to be installed then we'll need to update Jenkins via - https://github.com/theforeman/foreman-infra/blob/master/puppet/modules/slave/manifests/init.pp#L57. You can open a PR with to that repo with what you need and someone will review and deploy it.