message: core: silence command denied
  This is usually captured at a higher level, so we don't need to keep
  shouting there.
diff: @@ -188,7 +188,9 @@ void MavlinkCommandSender::receive_command_ack(mavlink_message_t message)
  break;
  case MAV_RESULT_DENIED:
  - LogWarn() << "command denied (" << work->identification.command << ").";
  + if (_command_debugging) {
  + LogDebug() << "command denied (" << work->identification.command << ").";
  + }
  _parent.unregister_timeout_handler(work->timeout_cookie);
  temp_result = {Result::Denied, NAN};
  _work_queue.erase(it);
  