message: integration_tests: add output if RC is valid
diff: using namespace mavsdk;
  void print_health(Telemetry::Health health);
  +void print_rc_status(Telemetry::RcStatus rc_status);
  TEST_F(SitlTest, TelemetryHealth)
  {
  @@ -20,6 +21,7 @@ TEST_F(SitlTest, TelemetryHealth)
  auto telemetry = std::make_shared<Telemetry>(system);
  telemetry->subscribe_health(std::bind(&print_health, std::placeholders::_1));
  + telemetry->subscribe_rc_status(std::bind(&print_rc_status, std::placeholders::_1));
  std::this_thread::sleep_for(std::chrono::seconds(3));
  }
  @@ -39,3 +41,10 @@ void print_health(Telemetry::Health health)
  std::cout << "Global position: " << (health.is_global_position_ok ? "ok" : "not ok") << '\n';
  std::cout << "Home position: " << (health.is_home_position_ok ? "ok" : "not ok") << '\n';
  }
  +
  +void print_rc_status(Telemetry::RcStatus rc_status)
  +{
  + std::cout << "RC available: " << (rc_status.is_available ? "yes" : "no") << '\n';
  + std::cout << "RC available once: " << (rc_status.was_available_once ? "yes" : "no") << '\n';
  + std::cout << "RC RSSI: " << rc_status.signal_strength_percent << '\n';
  +}
  