AP_Vehicle: init networking after serial manager

init before serial manager led to not seeing any error messages if net
init failed

libraries/AP_Vehicle/AP_Vehicle.cpp

@@ -313,16 +313,16 @@ void AP_Vehicle::setup()
     gcs().init();
 #endif
 
-#if AP_NETWORKING_ENABLED
-    networking.init();
-#endif
-
     // initialise serial ports
     serial_manager.init();
 #if HAL_GCS_ENABLED
     gcs().setup_console();
 #endif
 
+#if AP_NETWORKING_ENABLED
+    networking.init();
+#endif
+
     // Register scheduler_delay_cb, which will run anytime you have
     // more than 5ms remaining in your call to hal.scheduler->delay
     hal.scheduler->register_delay_callback(scheduler_delay_callback, 5);