[KYUUBI #2696] [TEST] Stop NoopServer should not throw exception

### _Why are the changes needed?_

Stop NoopServer should not throw exception

### _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

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

Closes #2696 from pan3793/noop.

Closes #2696

02c98503 [Cheng Pan] [TEST] Stop NoopServer should not throw exception

Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>

kyuubi-common/src/test/scala/org/apache/kyuubi/service/AbstractNoopServer.scala

@@ -17,8 +17,6 @@
 
 package org.apache.kyuubi.service
 
-import org.apache.kyuubi.KyuubiException
-
 abstract class AbstractNoopServer(name: String) extends Serverable(name) {
 
   override val backendService = new NoopBackendService
@@ -33,6 +31,6 @@ abstract class AbstractNoopServer(name: String) extends Serverable(name) {
   }
 
   override protected def stopServer(): Unit = {
-    throw new KyuubiException("no need to stop me")
+    logger.info(s"$name stopped.")
   }
 }