testing: make curve25519 the default DH group

testing/tests/ikev2/rw-eap-sim-only-radius/hosts/carol/etc/strongswan.conf

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac xcbc stroke kernel-netlink socket-default fips-prf eap-sim eap-sim-file updown
+  load = random nonce aes sha1 sha2 curve25519 hmac stroke kernel-netlink socket-default fips-prf eap-sim eap-sim-file updown
 }

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

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac xcbc stroke kernel-netlink socket-default fips-prf eap-sim eap-sim-file updown
+  load = random nonce aes sha1 sha2 curve25519 hmac stroke kernel-netlink socket-default fips-prf eap-sim eap-sim-file updown
 }

testing/tests/ikev2/rw-eap-sim-only-radius/hosts/moon/etc/strongswan.conf

@@ -1,7 +1,8 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac xcbc stroke kernel-netlink socket-default fips-prf eap-radius updown
+  load = random nonce aes sha1 sha2 md5 curve25519 hmac stroke kernel-netlink socket-default eap-radius updown
+
   plugins {
     eap-radius {
       secret = gv6URkSs 

testing/tests/ikev2/rw-eap-sim-only-radius/pretest.dat

@@ -1,3 +1,6 @@
+moon::rm /etc/ipsec.d/cacerts/*
+carol::rm /etc/ipsec.d/cacerts/*
+dave::rm /etc/ipsec.d/cacerts/*
 moon::iptables-restore < /etc/iptables.rules
 carol::iptables-restore < /etc/iptables.rules
 dave::iptables-restore < /etc/iptables.rules