[KYUUBI #2558] fix warn message

### _Why are the changes needed?_

### _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 #2559 from deadwind4/KYUUBI-2558.

Closes #2558

ea674d5 [Ada Wang] [KYUUBI #2558] fix warn message

Authored-by: Ada Wang <wang4luning@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>

Author: a49a

kyuubi-server/src/main/scala/org/apache/kyuubi/engine/hive/HiveProcessBuilder.scala

@@ -78,15 +78,15 @@ class HiveProcessBuilder(
     val extraCp = conf.get(ENGINE_HIVE_EXTRA_CLASSPATH)
     extraCp.foreach(classpathEntries.add)
     if (hadoopCp.isEmpty && extraCp.isEmpty) {
-      warn(s"The conf of ${HIVE_HADOOP_CLASSPATH} or ${ENGINE_HIVE_EXTRA_CLASSPATH} is empty.")
+      warn(s"The conf of ${HIVE_HADOOP_CLASSPATH} and ${ENGINE_HIVE_EXTRA_CLASSPATH.key} is empty.")
       debug("Detected development environment")
       mainResource.foreach { path =>
         val devHadoopJars = Paths.get(path).getParent
           .resolve(s"scala-$SCALA_COMPILE_VERSION")
           .resolve("jars")
         if (!Files.exists(devHadoopJars)) {
           throw new KyuubiException(s"The path $devHadoopJars does not exists. " +
-            s"Please set ${HIVE_HADOOP_CLASSPATH} or ${ENGINE_HIVE_EXTRA_CLASSPATH} for " +
+            s"Please set ${HIVE_HADOOP_CLASSPATH} or ${ENGINE_HIVE_EXTRA_CLASSPATH.key} for " +
             s"configuring location of hadoop client jars, etc")
         }
         classpathEntries.add(s"$devHadoopJars${File.separator}*")