Drop fedmsg_qa_network concept
    
    I don't think this is needed any more. openQA publishes natively
    to fedora-messaging these days, and these groups never have done
    anything there. ResultsDB still publishes to fedmsg, it seems,
    but the new instances were not added to these groups and I don't
    think we need/want to do that, we should just make sure they
    have the necessary access via other more widely-used groups if
    anything. (It seems like the restrictions these groups used to
    affect have been - possibly temporarily - removed entirely at
    present, but we can figure out any necessary changes there if the
    restrictions are restored).
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>