testing: Add libipsec scenarios that exchange raw ESP packets

testing/tests/libipsec/net2net-cert-raw/hosts/moon/etc/strongswan.conf

@@ -0,0 +1,15 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+swanctl {
+  load = pem pkcs1 x509 revocation constraints pubkey openssl random
+}
+
+charon-systemd {
+  load = random nonce aes sha1 sha2 gcm pem pkcs1 curve25519 gmp x509 curl revocation hmac kdf vici kernel-libipsec kernel-netlink socket-default updown
+  multiple_authentication = no
+  plugins {
+    kernel-libipsec {
+      raw_esp = yes
+    }
+  }
+}