Lower NAT port mapping disabled log msg from WARNING to INFO

src/switch_nat.c

@@ -586,7 +586,7 @@ SWITCH_DECLARE(switch_status_t) switch_nat_add_mapping_internal(switch_port_t po
 	switch_event_t *event = NULL;
 
 	if (!nat_globals.mapping) {
-		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "NAT port mapping disabled\n");
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "NAT port mapping disabled\n");
 		return status;
 	}