- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 3.0.0
* Operating System version: Mac OS Big Sur 11.4
* Java version: 1.8

### Steps to reproduce this issue

1. 克隆dubbo代码，检出3.0版本的tag；
2. 修改demo工程，制造1个rest协议报错的case；
3. 启动demo工程 /dubbo-demo/dubbo-demo-xml/dubbo-demo-xml-provider；
4. 观察控制台日志，发现有部分错误日志被打印到了StdError，截图如下：

![image](https://user-images.githubusercontent.com/22830937/122713904-058eb580-d299-11eb-935e-4080d6ab6e00.png)

### Expected Result

将错误日志桥接到Dubbo自己的日志系统，而非打印到StdError。

### Actual Result

错误日志打印到了StdError，导致基于Dubbo日志做的收集和其它扩展失效。

关键代码：

1. 类文件： ``org.apache.dubbo.remoting.http.jetty.JettyHttpServer``；
2. 代码位置：第33行 ``Log.setLog(new StdErrLog());``。
private static final Logger logger = LoggerFactory.getLogger(JettyHttpServer.class);
    private Server server;
    private URL url;
    public JettyHttpServer(URL url, final HttpHandler handler) {
        super(url, handler);
        this.url = url;
        
        
        Log.setLog(new StdErrLog());
        Log.getLog().setDebugEnabled(false);
        DispatcherServlet.addHttpHandler(url.getParameter(Constants.BIND_PORT_KEY, url.getPort()), handler);
        int threads = url.getParameter(THREADS_KEY, DEFAULT_THREADS);
        QueuedThreadPool threadPool = new QueuedThreadPool();
        threadPool.setDaemon(true);
        threadPool.setMaxThreads(threads);
        threadPool.setMinThreads(threads);
        server = new Server(threadPool);
        ServerConnector connector = new ServerConnector(server);
        String bindIp = url.getParameter(Constants.BIND_IP_KEY, url.getHost());
        if (!url.isAnyHost() && NetUtils.isValidLocalHost(bindIp)) {
            connector.setHost(bindIp);
        }
        connector.setPort(url.getParameter(Constants.BIND_PORT_KEY, url.getPort()));
        server.addConnector(connector);
        ServletHandler servletHandler = new ServletHandler();