service: use systemd if running, fallback to sysv5 if not

sbin/service

@@ -35,7 +35,9 @@ while [ $# -gt 0 ]; do
    esac
 done
 
-if [ -x "${INITDDIR}/${SERVICE}" ]; then
+if [ -d /run/systemd ]; then
+   systemctl ${OPTIONS} ${SERVICE}.service
+elif [ -x "${INITDDIR}/${SERVICE}" ]; then
    env -i PATH="$PATH" TERM="$TERM" "${INITDDIR}/${SERVICE}" ${OPTIONS}
 else
    echo "${SERVICE}: "$"unrecognized service" >&2