testing: Converterd tnc to systemd

testing/tests/tnc/tnccs-20-mutual-eap/pretest.dat

@@ -1,7 +1,7 @@
 moon::iptables-restore < /etc/iptables.rules
 sun::iptables-restore < /etc/iptables.rules
-moon::service charon start
-sun::service charon start
+moon::systemctl start strongswan-swanctl
+sun::systemctl start strongswan-swanctl
 sun::expect-connection mutual
 moon::expect-connection mutual
 moon::swanctl --initiate --child mutual