HDFS-11278. Add missing @Test annotation for TestSafeMode.testSafeModeUtils() (Contributed by Lukas Majercak via Daniel Templeton)

(cherry picked from commit ce3613c965)

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

@@ -482,6 +482,7 @@ public class TestSafeMode {
    * Tests some utility methods that surround the SafeMode's state.
    * @throws IOException when there's an issue connecting to the test DFS.
    */
+  @Test
   public void testSafeModeUtils() throws IOException {
     dfs = cluster.getFileSystem();