testing: Added mgf1 plugin to load statement

testing/tests/ikev2/rw-eap-ttls-only/hosts/dave/etc/strongswan.conf

@@ -1,7 +1,7 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = random nonce aes sha1 sha2 md5 pem pkcs1 curve25519 gmp x509 curl revocation hmac stroke kernel-netlink socket-default eap-identity eap-md5 eap-ttls updown
+  load = random nonce aes sha1 sha2 md5 pem pkcs1 curve25519 mfg1 gmp x509 curl revocation hmac stroke kernel-netlink socket-default eap-identity eap-md5 eap-ttls updown
   multiple_authentication=no
   syslog {
     daemon {