Fix the change log to reflect that HADOOP-4116 is reverted in 0.18.2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.19@708642 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -95,6 +95,8 @@ Release 0.19.0 - Unreleased
     dfs.datanode.du.pct is no longer used and is removed from the 
     hadoop-default.xml. (Suresh Srinivas via hairong)
 
+    HADOOP-4116. Balancer should provide better resource management. (hairong)
+
   NEW FEATURES
 
     HADOOP-3341. Allow streaming jobs to specify the field separator for map
@@ -964,8 +966,6 @@ Release 0.18.2 - Unreleased
 
   BUG FIXES
 
-    HADOOP-4116. Balancer should provide better resource management. (hairong)
-
     HADOOP-3614. Fix a bug that Datanode may use an old GenerationStamp to get
     meta file. (szetszwo)