Added three new groupinstall definitions to include Qpid bits

The new descriptions are very similar to the existing ones. I read up on inheritance of group install definitions, but it seems that is not allowed. This introduces qpid specific groupinstall definitions: one for pulp-server, one for pulp-consumer, and one for qpid-cpp-server that includes the durability packages.
I'll trust that you're confident that this extra white space is OK in xml.