added pluto's plugins in ikev1/attr-cert scenario

testing/tests/ikev1/attr-cert/hosts/moon/etc/strongswan.conf

@@ -1,3 +1,7 @@
+pluto {
+  load = sha1 sha2 md5 aes des hmac random curl
+}
+
 openac {
   load = sha1 sha2 md5 gmp random x509 pubkey
 }