Adapt test configurations

Adapt test configurations to the new Debian-based system.

testing/tests/ikev1/dynamic-responder/posttest.dat

@@ -2,8 +2,6 @@ dave::ipsec stop
 carol::ipsec stop
 dave::sleep 1
 moon::ipsec stop
-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
+carol::iptables-restore < /etc/iptables.flush
 dave::rm /etc/ipsec.d/certs/*
 dave::rm /etc/ipsec.d/private/*