MAPREDUCE-5448. Addendum fix to remove deprecation warning by junit.Assert import in TestFileOutputCommitter.

(cherry picked from commit 4cd54d9a297435150ab61803284eb05603f114e2)

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/lib/output/TestFileOutputCommitter.java

@@ -27,7 +27,6 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
-import junit.framework.Assert;
 import junit.framework.TestCase;
 
 import org.apache.commons.logging.Log;
@@ -315,7 +314,7 @@ public class TestFileOutputCommitter extends TestCase {
     try {
       MapFileOutputFormat.getReaders(outDir, conf);
     } catch (Exception e) {
-      Assert.fail("Fail to read from MapFileOutputFormat: " + e);
+      fail("Fail to read from MapFileOutputFormat: " + e);
       e.printStackTrace();
     }