controller: Add parameter for maximum log level to initiate/terminate_*()

Previously, the logger installed by the controller always announced
LEVEL_PRIVATE(4), which produced completely useless logging calls with
the common clients (vici/stroke) whose default log level is LEVEL_CTRL(1).
This can produce quite some overhead if there are e.g. a lot of concurrent
initiate() calls.

src/libcharon/plugins/medcli/medcli_config.c

@@ -349,8 +349,8 @@ static job_requeue_t initiate_config(peer_cfg_t *peer_cfg)
 		child_cfg->get_ref(child_cfg);
 		peer_cfg->get_ref(peer_cfg);
 		enumerator->destroy(enumerator);
-		charon->controller->initiate(charon->controller,
-									 peer_cfg, child_cfg, NULL, NULL, 0, FALSE);
+		charon->controller->initiate(charon->controller, peer_cfg, child_cfg,
+									 NULL, NULL, 0, 0, FALSE);
 	}
 	else
 	{