use iptables-restore in all ikev2 firewall scenarios

testing/tests/ikev2/net2net-psk-fail/pretest.dat

@@ -1,5 +1,5 @@
-moon::/etc/init.d/iptables start 2> /dev/null
-sun::/etc/init.d/iptables start 2> /dev/null
+moon::iptables-restore < /etc/iptables.rules
+sun::iptables-restore < /etc/iptables.rules
 moon::rm /etc/ipsec.d/cacerts/*
 sun::rm /etc/ipsec.d/cacerts/*
 moon::ipsec start