testing: Load kdf plugin in all scenarios that require it

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

testing/tests/openssl-ikev2/alg-ecp-brainpool-high/hosts/dave/etc/strongswan.conf

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = random nonce aes sha1 sha2 gmp pem pkcs1 hmac x509 openssl curl revocation vici kernel-netlink socket-default updown
+  load = random nonce aes sha1 sha2 gmp pem pkcs1 hmac kdf x509 openssl curl revocation vici kernel-netlink socket-default updown
 }

testing/tests/openssl-ikev2/alg-ecp-brainpool-low/hosts/dave/etc/strongswan.conf

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = random nonce aes des sha1 sha2 gmp pem pkcs1 hmac x509 openssl curl revocation vici kernel-netlink socket-default updown
+  load = random nonce aes des sha1 sha2 gmp pem pkcs1 hmac kdf x509 openssl curl revocation vici kernel-netlink socket-default updown
 }

testing/tests/openssl-ikev2/alg-ecp-high/hosts/dave/etc/strongswan.conf

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = random nonce aes sha1 sha2 gmp pem pkcs1 hmac x509 openssl curl revocation vici kernel-netlink socket-default updown
+  load = random nonce aes sha1 sha2 gmp pem pkcs1 hmac kdf x509 openssl curl revocation vici kernel-netlink socket-default updown
 }

testing/tests/openssl-ikev2/alg-ecp-low/hosts/dave/etc/strongswan.conf

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = random nonce aes des sha1 sha2 gmp pem pkcs1 hmac x509 openssl curl revocation vici kernel-netlink socket-default updown
+  load = random nonce aes des sha1 sha2 gmp pem pkcs1 hmac kdf x509 openssl curl revocation vici kernel-netlink socket-default updown
 }

testing/tests/openssl-ikev2/rw-cert/hosts/dave/etc/strongswan.conf

@@ -1,7 +1,7 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = test-vectors aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac xcbc cmac ctr ccm gcm vici kernel-netlink socket-default updown
+  load = test-vectors aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac kdf xcbc cmac ctr ccm gcm vici kernel-netlink socket-default updown
 
   integrity_test = yes
   crypto_test {