[KYUUBI #886][FOLLOWUP] Support to reload hadoop conf for KyuubiTHttpFrontendService

### _Why are the changes needed?_

Support to reload hadoop conf for KyuubiTHttpFrontendService.

See details in #2742

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #2899 from turboFei/http_followup.

Closes #886

c480aa2 [Fei Wang] [KYUUBI #886][FOLLOWUP] Support to reload hadoop conf for KyuubiTHttpFrontendService

Authored-by: Fei Wang <fwang12@ebay.com>
Signed-off-by: Fei Wang <fwang12@ebay.com>

Author: turboFei

kyuubi-server/src/main/scala/org/apache/kyuubi/server/KyuubiTHttpFrontendService.scala

@@ -23,6 +23,7 @@ import javax.security.sasl.AuthenticationException
 import javax.servlet.{ServletContextEvent, ServletContextListener}
 
 import org.apache.commons.lang3.SystemUtils
+import org.apache.hadoop.conf.Configuration
 import org.apache.hive.service.rpc.thrift.{TCLIService, TOpenSessionReq}
 import org.apache.thrift.protocol.TBinaryProtocol
 import org.eclipse.jetty.http.HttpMethod
@@ -62,6 +63,8 @@ final class KyuubiTHttpFrontendService(
   private var server: Option[Server] = None
   private val APPLICATION_THRIFT = "application/x-thrift"
 
+  override protected def hadoopConf: Configuration = KyuubiServer.getHadoopConf()
+
   /**
    * Configure Jetty to serve http requests. Example of a client connection URL:
    * http://localhost:10000/servlets/thrifths2/ A gateway may cause actual target