message: telemetry: unregister timeouts on destruction only
  We should not drop timeouts just because a system is lost/timed out.
diff: @@ -70,6 +70,7 @@ void TelemetryImpl::init()
  void TelemetryImpl::deinit()
  {
  + _parent->unregister_timeout_handler(_timeout_cookie);
  _parent->unregister_param_changed_handler(this);
  _parent->unregister_all_mavlink_message_handlers(this);
  }
  @@ -118,10 +119,7 @@ void TelemetryImpl::enable()
  std::placeholders::_2));
  }
  -void TelemetryImpl::disable()
  -{
  - _parent->unregister_timeout_handler(_timeout_cookie);
  -}
  +void TelemetryImpl::disable() {}
  Telemetry::Result TelemetryImpl::set_rate_position_velocity_ned(double rate_hz)
  {
  