Modify the CHANGES.txt to move YARN-2019 Commit log from branch 2.8 to

branch 2.7.2

(cherry picked from commit 6a5068970567817af78d6ec2dfe474b09533a8d2)

hadoop-yarn-project/CHANGES.txt

@@ -89,9 +89,6 @@ Release 2.8.0 - UNRELEASED
     YARN-2003. Support for Application priority : Changes in RM and Capacity 
     Scheduler. (Sunil G via wangda)
 
-    YARN-2019. Retrospect on decision of making RM crashed if any exception throw 
-    in ZKRMStateStore. (Jian He via junping_du)
-
     YARN-3656. LowCost: A Cost-Based Placement Agent for YARN Reservations. 
     (Jonathan Yaniv and Ishai Menache via curino)
 
@@ -773,6 +770,9 @@ Release 2.7.2 - UNRELEASED
 
   NEW FEATURES
 
+    YARN-2019. Retrospect on decision of making RM crashed if any exception throw 
+    in ZKRMStateStore. (Jian He via junping_du)
+
   IMPROVEMENTS
 
     YARN-3170. YARN architecture document needs updating. (Brahma Reddy Battula