Change incorrect jira number HDFS-4151 to HDFS-4451 and move it to incompatible section.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1441123 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -314,6 +314,10 @@ Release 2.0.3-alpha - Unreleased
     HDFS-4369. GetBlockKeysResponseProto does not handle null response.
     (suresh)
 
+    HDFS-4451. hdfs balancer command returns exit code 1 on success instead
+    of 0. (Joshua Blatt via suresh)
+
+
   NEW FEATURES
 
     HDFS-2656. Add libwebhdfs, a pure C client based on WebHDFS.
@@ -738,9 +742,6 @@ Release 2.0.3-alpha - Unreleased
     HDFS-4428. FsDatasetImpl should disclose what the error is when a rename
     fails. (Colin Patrick McCabe via atm)
 
-    HDFS-4151. hdfs balancer command returns exit code 1 on success instead
-    of 0. (Joshua Blatt via suresh)
-
   BREAKDOWN OF HDFS-3077 SUBTASKS
 
     HDFS-3077. Quorum-based protocol for reading and writing edit logs.