Move HADOOP-12374 from 2.8.0 to 2.7.3 in CHANGES.txt.

(cherry picked from commit 47c79a2a4d265feff7bd997bf07473eeb74c1c4b)

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -372,9 +372,6 @@ Release 2.8.0 - UNRELEASED
 
   BUG FIXES
 
-    HADOOP-12374. Updated expunge command description.
-    (WeiWei Yang via eyang)
-
     HADOOP-12352. Delay in checkpointing Trash can leave trash for 2 intervals
     before deleting (Casey Brotherton via harsh)
 
@@ -822,6 +819,9 @@ Release 2.7.3 - UNRELEASED
     ImpersonationProvider, DefaultImpersonationProvider, and DistCp.
     (Arshad Mohammad via aajisaka)
 
+    HADOOP-12374. Updated expunge command description.
+    (WeiWei Yang via eyang)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES