MAPREDUCE-6931. Remove TestDFSIO "Total Throughput" calculation. Contributed by Dennis Huo.

(cherry picked from commit 3e0e2033cc28d48a7909822416478aff7487bfe6)

Conflicts:
	hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/fs/TestDFSIO.java

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/fs/TestDFSIO.java

@@ -815,7 +815,7 @@ public class TestDFSIO implements Tool {
       long tStart = System.currentTimeMillis();
       sequentialTest(fs, testType, nrBytes, nrFiles);
       long execTime = System.currentTimeMillis() - tStart;
-      String resultLine = "Seq Test exec time sec: " + (float)execTime / 1000;
+      String resultLine = "Seq Test exec time sec: " + msToSecs(execTime);
       LOG.info(resultLine);
       return 0;
     }
@@ -879,6 +879,10 @@ public class TestDFSIO implements Tool {
     return ((float)bytes)/MEGA;
   }
 
+  static float msToSecs(long timeMillis) {
+    return timeMillis / 1000.0f;
+  }
+
   private void analyzeResult( FileSystem fs,
                               TestType testType,
                               long execTime,
@@ -923,11 +927,10 @@ public class TestDFSIO implements Tool {
         "            Date & time: " + new Date(System.currentTimeMillis()),
         "        Number of files: " + tasks,
         " Total MBytes processed: " + df.format(toMB(size)),
-        "      Throughput mb/sec: " + df.format(size * 1000.0 / (time * MEGA)),
-        "Total Throughput mb/sec: " + df.format(toMB(size) / ((float)execTime)),
+        "      Throughput mb/sec: " + df.format(toMB(size) / msToSecs(time)),
         " Average IO rate mb/sec: " + df.format(med),
         "  IO rate std deviation: " + df.format(stdDev),
-        "     Test exec time sec: " + df.format((float)execTime / 1000),
+        "     Test exec time sec: " + df.format(msToSecs(execTime)),
         "" };
 
     PrintStream res = null;