greenwave policy: bodhi_update can't use remoterule
    
    So, I noticed today that Bodhi isn't showing openQA results any
    more. After poking through greenwave code all morning, this is
    my best cut at fixing it, though I still have questions.
    
    The problem seems to be that Greenwave is deciding no policy
    'matches' for the subject_type 'bodhi_update'. Because of that
    it doesn't attach the test results for that subject type from
    ResultsDB to the decision it sends Bodhi (the loop over subjects
    is short-circuited before the test results are retrieved if no
    policy is considered to 'match').
    
    It decides no policy matches because the only policy we have is
    a RemoteRule policy, but Greenwave doesn't think the bodhi_update
    subject type "supports" remote rules, and based on various bits
    of logic in greenwave, a policy which *only* specifies a
    RemoteRule, for a subject type which doesn't "support" them, will
    never be considered to "match".
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>