branched-composer: Send output of branched composes to releng-cron list
    
    We really want to save the output of branched jobs so we can easier
    track down issues and fix them.
    
    Normally this would be a freeze break, but I can't imagine how it would
    cause any issues and it's one character, so I am just doing it. :)
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>