testing: Add rw-eap-id-switch scenario

testing/tests/ikev2/rw-eap-id-switch/posttest.dat

@@ -0,0 +1,6 @@
+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