drop rsyslog service from all cloud kickstarts
    
    it's no longer pulled in by cloud-init (since 2014...). None
    of these kickstarts has it in %packages, and it's not in any
    of the cloud environment or package groups in comps either. So
    it seems like no-one particularly wants rsyslog in the cloud
    images.
    
    From compose logs, it looks like trying to enable a non-existent
    service in anaconda in Fedora 24 and earlier wasn't a fatal
    error (anaconda more or less logged a warning and continued),
    but in Fedora 25 and later it does seem to be fatal. It at least
    causes one anaconda thread to crash, though the image compose
    completes. I think possibly at least the way anaconda's run
    in the Cloud compose process, the main thread manages to exit,
    but it seems pretty likely the thread crash will result in
    problems in the produced image.
    
    Needed on master and f25.