testing: Converted libipsec/net2net-cert to swanctl

testing/tests/libipsec/net2net-cert/posttest.dat

@@ -1,4 +1,5 @@
-moon::ipsec stop
-sun::ipsec stop
+moon::swanctl --terminate --ike gw-gw 2> /dev/null
+moon::systemctl stop strongswan-swanctl
+sun::systemctl stop strongswan-swanctl
 moon::iptables-restore < /etc/iptables.flush
 sun::iptables-restore < /etc/iptables.flush