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/hosts/moon/etc/strongswan.conf.in

@@ -11,4 +11,7 @@ charon-tkm {
       fingerprint = CA_SPK_HEX
     }
   }
+  start-scripts {
+    swanctl = /usr/local/sbin/swanctl --load-all --noprompt
+  }
 }