Move HDFS-5138 to 2.4.0 section in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1581074 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -120,8 +120,6 @@ Trunk (Unreleased)
     HDFS-5721. sharedEditsImage in Namenode#initializeSharedEdits() should be 
     closed before method returns. (Ted Yu via junping_du)
 
-    HDFS-5138. Support HDFS upgrade in HA. (atm via todd)
-
   OPTIMIZATIONS
 
   BUG FIXES
@@ -438,6 +436,8 @@ Release 2.4.0 - UNRELEASED
     HDFS-6050. NFS does not handle exceptions correctly in a few places 
     (brandonli)
 
+    HDFS-5138. Support HDFS upgrade in HA. (atm via todd)
+
   OPTIMIZATIONS
 
     HDFS-5790. LeaseManager.findPath is very slow when many leases need recovery