added pfkey/esp-alg-null scenario

testing/tests/pfkey/esp-alg-null/hosts/moon/etc/strongswan.conf

@@ -0,0 +1,5 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+charon {
+  load = curl aes des sha1 sha2 md5 gmp random x509 pubkey hmac xcbc stroke kernel-pfkey kernel-netlink updown
+}