remove blanks.

Author: hfutatzhanghb

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/async/TestRouterAsyncMountTable.java

@@ -48,7 +48,7 @@
  */
 public class TestRouterAsyncMountTable {
   public static final Logger LOG = LoggerFactory.getLogger(TestRouterAsyncMountTable.class);
-  
+
   private static StateStoreDFSCluster cluster;
   private static MiniRouterDFSCluster.RouterContext routerContext;
   private static MountTableResolver mountTable;