blocked: tweak to query Bodhi directly for gating status
    
    Poking around the Bodhi source I found you can query on gating
    status (I had tried before, but hadn't guessed the right query
    arg name). This lets us do much more targeted initial queries.
    Unfortunately you can't currently query on multiple gating
    statuses at once, so we need a little loop until I can get that
    fixed.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>