YARN-3969. Updating CHANGES.txt to reflect the correct set of branches where this is committed

(cherry picked from commit fc42fa8ae3bc9d6d055090a7bb5e6f0c5972fcff)
(cherry picked from commit bddc48ed862bd783ce0907aa9c7c9585a5c48481)

hadoop-yarn-project/CHANGES.txt

@@ -35,6 +35,10 @@ Release 2.7.2 - UNRELEASED
     YARN-3878. AsyncDispatcher can hang while stopping if it is configured for
     draining events on stop. (Varun Saxena via jianhe)
 
+    YARN-3969. Allow jobs to be submitted to reservation that is active 
+    but does not have any allocations. (subru via curino)
+
+
 Release 2.7.1 - 2015-07-06 
 
   INCOMPATIBLE CHANGES
@@ -207,8 +211,6 @@ Release 2.7.1 - 2015-07-06
     YARN-3850. NM fails to read files from full disks which can lead to
     container logs being lost and other issues (Varun Saxena via jlowe)
 
-    YARN-3969. Allow jobs to be submitted to reservation that is active 
-    but does not have any allocations. (subru via curino)
 
 Release 2.7.0 - 2015-04-20