should enable access log to help diagnosis problems like request timeout

Polling kie got a timeout exception, but do not know if kie has received the request and how long it takes. Recommented kie enable access log.

```
2021-08-28 15:01:37,678 [ERROR] get configurations from KieConfigCenter failed, and will try again. org.apache.servicecomb.config.kie.client.KieConfigManager$PollConfigurationTask.execute(KieConfigManager.java:136)
org.apache.servicecomb.config.kie.client.exception.OperationException: read response failed.
at org.apache.servicecomb.config.kie.client.KieClient.queryConfigurations(KieClient.java:110)
at org.apache.servicecomb.config.kie.client.KieConfigManager$PollConfigurationTask.execute(KieConfigManager.java:124)
at org.apache.servicecomb.http.client.task.AbstractTask.lambda$startTask$1(AbstractTask.java:89)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
at sun.security.ssl.InputRecord.read(InputRecord.java:503)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:975)
at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:933)
at sun.security.ssl.AppInputStream.read(AppInputStream.java:105)
at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137)
at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153)
at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:280)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259)
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:157)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at org.apache.servicecomb.http.client.common.HttpTransportImpl.doRequest(HttpTransportImpl.java:93)
at org.apache.servicecomb.config.kie.client.KieClient.queryConfigurations(KieClient.java:87)
... 5 more
```

Start by tracing KieConfigManager$PollConfigurationTask.execute through KieClient.queryConfigurations and HttpTransportImpl.doRequest, the entry points named in the report. Determine where Kie receives the request and how its duration can be exposed in access logs; done means timeout diagnosis can show request receipt and elapsed time, with appropriate coverage for the logging behavior.

Written by the indexing model from the issue text.