use iptables-restore in all ikev2 firewall scenarios

testing/tests/ikev2/mobike-virtual-ip/pretest.dat

@@ -1,6 +1,6 @@
 alice::ifup eth1
-alice::/etc/init.d/iptables start 2> /dev/null
-sun::/etc/init.d/iptables start 2> /dev/null
+alice::iptables-restore < /etc/iptables.rules
+sun::iptables-restore < /etc/iptables.rules
 moon::echo 1 > /proc/sys/net/ipv4/ip_forward
 sun::ip route add 10.1.0.0/16 via PH_IP_MOON
 alice::ipsec start