testing: Add ikev2/rw-sig-auth scenario

testing/tests/ikev2/rw-sig-auth/posttest.dat

@@ -0,0 +1,6 @@
+moon::ipsec stop
+carol::ipsec stop
+dave::ipsec stop
+moon::iptables-restore < /etc/iptables.flush
+carol::iptables-restore < /etc/iptables.flush
+dave::iptables-restore < /etc/iptables.flush