charon-tkm: Don't use starter/stroke with charon-tkm anymore

For the tests, the unused init script that was used before switching to
charon-systemd is repurposed to manage the daemon.

testing/tests/tkm/host2host-responder/posttest.dat

@@ -1,4 +1,4 @@
-moon::DAEMON_NAME=charon-tkm ipsec stop
+moon::service charon-tkm stop
 moon::killall tkm_keymanager
 moon::rm -f /tmp/tkm.rpc.ike /tmp/tkm.rpc.ees /tmp/tkm.log
-sun::ipsec stop
+sun::systemctl stop strongswan