1091980 - Update install and upgrade docs with qpid client deps

https://bugzilla.redhat.com/show_bug.cgi?id=1091980

Adds qpid client dependency installation to the Installation and Pulp 2.3->2.4 upgrade docs.  We haven't made the docs broker agnostic, so this is written with the assumption that Qpid is being used, which is consistent with the existing docs.