Move YARN-3273 from 2.8 to 2.7.

(cherry picked from commit 5e9f4099de4b949c838a6224442f335c67d80936)

hadoop-yarn-project/CHANGES.txt

@@ -20,9 +20,6 @@ Release 2.8.0 - UNRELEASED
     YARN-3243. CapacityScheduler should pass headroom from parent to children
     to make sure ParentQueue obey its capacity limits. (Wangda Tan via jianhe)
 
-    YARN-3273. Improve scheduler UI to facilitate scheduling analysis and
-    debugging. (Rohith Sharmaks via jianhe)
-
     YARN-3357. Move TestFifoScheduler to FIFO package. (Rohith Sharmaks 
     via devaraj)
 
@@ -437,6 +434,9 @@ Release 2.7.0 - UNRELEASED
     YARN-2777. Mark the end of individual log in aggregated log.
     (Varun Saxena via xgong)
 
+    YARN-3273. Improve scheduler UI to facilitate scheduling analysis and
+    debugging. (Rohith Sharmaks via jianhe)
+
   OPTIMIZATIONS
 
     YARN-2990. FairScheduler's delay-scheduling always waits for node-local and