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/test.conf

@@ -19,3 +19,7 @@ TCPDUMPHOSTS="sun"
 # Used for IPsec logging purposes
 #
 IPSECHOSTS="moon sun"
+
+# charon controlled by swanctl
+#
+SWANCTL=1