- [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());``。
*
 *     http:www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.dubbo.remoting.http.jetty;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.NetUtils;
import org.apache.dubbo.remoting.Constants;
import org.apache.dubbo.remoting.http.HttpHandler;
import org.apache.dubbo.remoting.http.servlet.DispatcherServlet;
import org.apache.dubbo.remoting.http.servlet.ServletManager;
import org.apache.dubbo.remoting.http.support.AbstractHttpServer;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.StdErrLog;
import org.eclipse.jetty.util.thread.QueuedThreadPool;
import static org.apache.dubbo.common.constants.CommonConstants.DEFAULT_THREADS;
import static org.apache.dubbo.common.constants.CommonConstants.THREADS_KEY;
public class JettyHttpServer extends AbstractHttpServer {