YARN-2022. Fixing CHANGES.txt to be correctly placed.

svn merge --ignore-ancestry -c 1607486 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1607487 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -193,6 +193,10 @@ Release 2.5.0 - UNRELEASED
     TestContainersMonitor#testContainerKillOnMemoryOverflow.
     (Anubhav Dhoot via kasha)
 
+    YARN-2022. Preempting an Application Master container can be kept as least priority
+    when multiple applications are marked for preemption by 
+    ProportionalCapacityPreemptionPolicy (Sunil G via mayank)
+
     YARN-2241. ZKRMStateStore: On startup, show nicer messages if znodes already 
     exist. (Robert Kanter via kasha)