message: action: use magic number to kill
  After
  we need to add a magic number to the disarm command in order to disarm
  the vehicle even if in-air.
diff: @@ -96,6 +96,7 @@ Action::Result ActionImpl::kill() const
  command.command = MAV_CMD_COMPONENT_ARM_DISARM;
  command.params.param1 = 0.0f; // kill
  + command.params.param2 = 21196.f; // magic number to enforce in-air
  command.target_component_id = _parent->get_autopilot_id();
  return action_result_from_command_result(_parent->send_command(command));
  @@ -315,6 +316,7 @@ void ActionImpl::kill_async(const Action::result_callback_t& callback)
  command.command = MAV_CMD_COMPONENT_ARM_DISARM;
  command.params.param1 = 0.0f; // kill
  + command.params.param2 = 21196.f; // magic number to enforce in-air
  command.target_component_id = _parent->get_autopilot_id();
  _parent->send_command_async(
  