Controller: proper reconfiguration requests handling.

Now controller serializes all reconfiguration requests
and waits for result from router.

src/nxt_worker_process.c

@@ -22,6 +22,16 @@ static void nxt_worker_process_sigquit_handler(nxt_task_t *task, void *obj,
     void *data);
 
 
+nxt_port_handler_t  nxt_controller_process_port_handlers[] = {
+    nxt_worker_process_quit_handler,
+    nxt_port_new_port_handler,
+    nxt_port_change_log_file_handler,
+    nxt_port_mmap_handler,
+    nxt_port_controller_data_handler,
+    nxt_port_remove_pid_handler,
+};
+
+
 nxt_port_handler_t  nxt_worker_process_port_handlers[] = {
     nxt_worker_process_quit_handler,
     nxt_port_new_port_handler,