testing: Add libipsec/host2host-cert scenario

testing/tests/libipsec/host2host-cert/hosts/moon/etc/strongswan.conf

@@ -0,0 +1,17 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+charon {
+  load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 revocation hmac stroke kernel-libipsec kernel-netlink socket-default updown
+  multiple_authentication = no
+  plugins {
+    kernel-netlink {
+      fwmark = !0x42
+    }
+    socket-default {
+      fwmark = 0x42
+    }
+    kernel-libipsec {
+      allow_peer_ts = yes
+    }
+  }
+}