added two scenarios testing repeated authentication (RFC 4478)

testing/tests/ikev2/reauth-early/pretest.dat

@@ -0,0 +1,7 @@
+moon::/etc/init.d/iptables start 2> /dev/null
+carol::/etc/init.d/iptables start 2> /dev/null
+moon::ipsec start
+carol::ipsec start
+carol::sleep 1
+carol::ipsec up home
+carol::sleep 30