ccs_update_schema: service.sh and vm.sh have to be specialcased
    
    both ras have a special set of references within cluster.rng.in.head.
    
    We need to make sure they exist or use stubs
    
    Resolves: rhbz#680930
    
    Reviewed-by: Lon Hohberger <lhh@redhat.com>
    Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>