fix checkstyle.

Author: zhtttylz

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRecovery2.java

@@ -30,6 +30,8 @@
 import java.util.Map;
 
 import java.util.function.Supplier;
+
+import org.junit.jupiter.api.AfterAll;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.apache.hadoop.conf.Configuration;
@@ -112,8 +114,8 @@ public void startUp() throws IOException {
    * stop the cluster
    * @throws IOException
    */
-  @AfterEach
-  public void tearDown() throws IOException {
+  @AfterAll
+  public static void tearDown() throws IOException {
     if (cluster != null) {
       IOUtils.closeStream(dfs);
       cluster.shutdown();