Move HDFS-4200 to branch-2.4.0 section in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1573046 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -109,9 +109,6 @@ Trunk (Unreleased)
     HDFS-4052. BlockManager#invalidateWork should print log outside the lock.
     (Jing Zhao via suresh)
 
-    HDFS-4200. Reduce the size of synchronized sections in PacketResponder.
-    (suresh)
-
     HDFS-3358. Specify explicitly that the NN UI status total is talking
     of persistent objects on heap. (harsh)
 
@@ -370,6 +367,9 @@ Release 2.4.0 - UNRELEASED
     HDFS-6030. Remove an unused constructor in INode.java.  (yzhang via
     cmccabe)
 
+    HDFS-4200. Reduce the size of synchronized sections in PacketResponder.
+    (suresh)
+
   OPTIMIZATIONS
 
     HDFS-5790. LeaseManager.findPath is very slow when many leases need recovery