HDFS-1000. Fixed CHANGES.txt to have the comment for HDFS-1000 in the 0.21 section.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hdfs/trunk@956117 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -81,8 +81,6 @@ Trunk (unreleased changes)
 
     HDSF-1198. Resolving cross-realm principals. (Jitendra Pandey via jghoman)
 
-    HDFS-1000. Updates libhdfs to the new API for UGI (ddas)
-
 Release 0.21.0 - Unreleased
 
   INCOMPATIBLE CHANGES
@@ -979,6 +977,8 @@ Release 0.21.0 - Unreleased
     HDFS-1138. Prevent erroneous updation of modification time of a directory
     when fsimage loads. (Dmytro Molkov via dhruba)
 
+    HDFS-1000. Updates libhdfs to the new API for UGI (ddas)
+
 Release 0.20.3 - Unreleased
 
   IMPROVEMENTS