Build: remove init/SystemV directory
    
    FreeIPA has hard dependency on systemd for a long time already.
    SystemV directory was just polluting the tarball (while being useless).
    
    https://fedorahosted.org/freeipa/ticket/6418
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>