openqa: conditionally skip relvalconsumer and check-compose
    
    We don't really want/need these roles in IAD yet at all, but the
    way the plays are right now we're sort of required to do them.
    This skips the queues and roles if a key variable isn't defined,
    which should let us skip these cleanly for the IAD deployment.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>