MAPREDUCE-7348. TestFrameworkUploader#testNativeIO fails. (#3053)

Reviewed-by: Hui Fei <ferhui@apache.org>

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-uploader/src/test/java/org/apache/hadoop/mapred/uploader/TestFrameworkUploader.java

@@ -477,7 +477,7 @@ public class TestFrameworkUploader {
       }
       Assert.assertFalse(uploader.checkSymlink(symlinkOutside));
     } finally {
-      FileUtils.deleteDirectory(parent);
+      FileUtils.forceDelete(parent);
     }
 
   }