More cleanup on the openQA AMQP stuff
    
    nirik and I went around and around a bit today and ended up back
    where we started, but with a clearer understanding of where that
    this. This explains it a bit better, and makes what's actually
    going on in various places clearer with the use of appropriate
    shared variables. This should not actually *change* anything at
    all when deployed.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>