burn down all the 'wait' stuff, use get_jobs not iterate_jobs
    
    AHAHAHAHAHAAHAHA KILL IT WITH FIRE
    
    ahem.
    
    All this godawful 'waiting' stuff was from the dark, dark days
    before we got fedmsgs for completed composes and openQA jobs.
    Now all is sweetness and light, we don't need it any more. So
    let's kill it, for the love of God.