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/multiple-clients/posttest.dat

@@ -1,5 +1,5 @@
-sun::DAEMON_NAME=charon-tkm ipsec stop
+sun::service charon-tkm stop
 sun::killall tkm_keymanager
 sun::rm -f /tmp/tkm.rpc.ike /tmp/tkm.rpc.ees /tmp/tkm.log
-carol::ipsec stop
-dave::ipsec stop
+carol::systemctl stop strongswan
+dave::systemctl stop strongswan