partially fix TestPipeApplication

Author: stoty

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/pipes/TestPipeApplication.java

@@ -520,10 +520,6 @@ private static class SocketCleaner extends PingSocketCleaner {
     }
 
     @Override
-    public void work() {
-      super.run();
-    }
-
     protected void closeSocketInternal(Socket clientSocket) {
       if (!clientSocket.isClosed()) {
         closeSocketCount++;