activated iptables in some ikev2 scenarios

testing/tests/ikev2/rw-eap-ttls-radius/posttest.dat

@@ -2,6 +2,6 @@ moon::ipsec stop
 carol::ipsec stop
 dave::ipsec stop
 alice::killall radiusd
-moon::/etc/init.d/iptables stop 2> /dev/null
-carol::/etc/init.d/iptables stop 2> /dev/null
-dave::/etc/init.d/iptables stop 2> /dev/null
+moon::iptables-restore < /etc/iptables.flush
+carol::iptables-restore < /etc/iptables.flush
+dave::iptables-restore < /etc/iptables.flush