[SPARK-4619][Storage]delete redundant time suffix

Time suffix exists in Utils.getUsedTimeMs(startTime), no need to append again, delete that

Author: maji2014 <maji3@asiainfo.com>

Closes #3475 from maji2014/SPARK-4619 and squashes the following commits:

df0da4e [maji2014] delete redundant time suffix

core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala

@@ -265,7 +265,7 @@ final class ShuffleBlockFetcherIterator(
 
     // Get Local Blocks
     fetchLocalBlocks()
-    logDebug("Got local blocks in " + Utils.getUsedTimeMs(startTime) + " ms")
+    logDebug("Got local blocks in " + Utils.getUsedTimeMs(startTime))
   }
 
   override def hasNext: Boolean = numBlocksProcessed < numBlocksToFetch