plugin load configuration in strongswan.conf

some components accept a "component.load" option with a space separated list of plugins to load
  libcharon- plugins are now handled the same way as libstrongswan- plugins

src/openac/openac.c

@@ -267,7 +267,9 @@ int main(int argc, char **argv)
 
 	/* initialize library */
 	library_init(STRONGSWAN_CONF);
-	lib->plugins->load(lib->plugins, IPSEC_PLUGINDIR, "libstrongswan-");
+	lib->plugins->load(lib->plugins, IPSEC_PLUGINDIR, 
+		lib->settings->get_str(lib->settings, "openac.load", 
+		   "gmp hmac md5 random sha1 sha2 pubkey x509"))
 
 	/* initialize optionsfrom */
 	options_t *options = options_create();