testing: Load kdf plugin in all scenarios that require it

Once we use plugin-provided prf+() these won't work otherwise.

testing/tests/wolfssl/rw-modp3072/hosts/carol/etc/strongswan.conf

@@ -5,7 +5,7 @@ swanctl {
 }
 
 charon-systemd {
-  load = nonce pem wolfssl pkcs1 x509 revocation constraints pubkey curl kernel-netlink socket-default updown vici
+  load = nonce kdf pem wolfssl pkcs1 x509 revocation constraints pubkey curl kernel-netlink socket-default updown vici
 
   rsa_pss = yes
 }

testing/tests/wolfssl/rw-modp3072/hosts/dave/etc/strongswan.conf

@@ -5,7 +5,7 @@ swanctl {
 }
 
 charon-systemd {
-  load = random nonce sha1 sha2 aes hmac mgf1 pem pkcs1 x509 revocation constraints pubkey gmp curl kernel-netlink socket-default updown vici
+  load = random nonce sha1 sha2 aes hmac kdf mgf1 pem pkcs1 x509 revocation constraints pubkey gmp curl kernel-netlink socket-default updown vici
 
   rsa_pss = yes
 }

testing/tests/wolfssl/rw-modp3072/hosts/moon/etc/strongswan.conf

@@ -5,7 +5,7 @@ swanctl {
 }
 
 charon-systemd {
-  load = nonce test-vectors pem wolfssl pkcs1 x509 revocation constraints pubkey curl kernel-netlink socket-default updown vici
+  load = nonce test-vectors kdf pem wolfssl pkcs1 x509 revocation constraints pubkey curl kernel-netlink socket-default updown vici
 
   rsa_pss = yes
 }