HADOOP-8567. Adding CHANGES.txt change missed in the commit 1402639.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1402641 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -29,6 +29,9 @@ Release 1.2.0 - unreleased
     HDFS-3912. Detect and avoid stale datanodes for writes.
     (Jing Zhao via suresh)
 
+    HADOOP-8567. Port conf servlet to dump running configuration  to 
+    branch 1.x. (todd, Backported by Jing Zhao via suresh)
+
   IMPROVEMENTS
 
     HDFS-3515. Port HDFS-1457 to branch-1. (eli)