added ikev2/net2net-pubkey scenario

testing/tests/ikev2/net2net-pubkey/description.txt

@@ -0,0 +1,7 @@
+A connection between the subnets behind the gateways <b>moon</b> and <b>sun</b> is set up.
+The authentication is based on <b>raw RSA keys</b> loaded in PKCS#1 format.
+<p/>
+Upon the successful establishment of the IPsec tunnel, <b>leftfirewall=yes</b>
+automatically inserts iptables-based firewall rules that let pass the tunneled traffic.
+In order to test both tunnel and firewall, client <b>alice</b> behind gateway <b>moon</b>
+pings client <b>bob</b> located behind gateway <b>sun</b>.