added two-certs scenario

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

@@ -0,0 +1,9 @@
+moon::/etc/init.d/iptables start 2> /dev/null
+carol::/etc/init.d/iptables start 2> /dev/null
+dave::/etc/init.d/iptables start 2> /dev/null
+moon::ipsec start
+carol::ipsec start
+dave::ipsec start
+carol::sleep 1
+carol::ipsec up home
+dave::ipsec up home