testing: Add ikev2/net2net-route-narrow scenario

testing/tests/ikev2/net2net-route-narrow/hosts/sun/etc/strongswan.conf

@@ -0,0 +1,16 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+swanctl {
+  load = pem pkcs1 revocation constraints pubkey openssl random
+}
+
+charon-systemd {
+  load = random nonce openssl pem pkcs1 revocation kernel-netlink socket-default updown vici
+  # delete rekeyed CHILD_SAs quickly so we can reauthenticate the IKE_SA
+  delete_rekeyed_delay = 1
+  syslog {
+    daemon {
+      cfg = 2
+    }
+  }
+}