DefaultAsyncAutoConfiguration override a implicit AsyncTaskExecutor #313

@Configuration
@ConditionalOnMissingBean(AsyncConfigurer.class)
  static class DefaultTracedAsyncConfigurerSupport extends AsyncConfigurerSupport {
    @Autowired
    @Lazy
    private Tracer tracer;
    @Override
    public Executor getAsyncExecutor() {
      return new TracedExecutor(new SimpleAsyncTaskExecutor(), tracer);
    }
  }