testing: Add ikev2/rw-cert-multi-ke scenario

testing/tests/ikev2/rw-cert-multi-ke/posttest.dat

@@ -0,0 +1,8 @@
+carol::swanctl --terminate --ike home
+dave::swanctl --terminate --ike home
+carol::systemctl stop strongswan
+dave::systemctl stop strongswan
+moon::systemctl stop strongswan
+moon::iptables-restore < /etc/iptables.flush
+carol::iptables-restore < /etc/iptables.flush
+dave::iptables-restore < /etc/iptables.flush