added two-certs scenario

testing/tests/ikev2/two-certs/posttest.dat

@@ -0,0 +1,7 @@
+moon::ipsec stop
+carol::ipsec stop
+dave::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
+moon::rm /etc/ipsec.d/certs/*