Move HDFS-8540 to 2.8 in CHANGES.txt.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -629,6 +629,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8499. Refactor BlockInfo class hierarchy with static helper class.
     (Zhe Zhang via wang)
 
+    HDFS-8540.  Mover should exit with NO_MOVE_BLOCK if no block can be moved.
+    (surendra singh lilhore via szetszwo)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than
@@ -917,9 +920,6 @@ Release 2.7.1 - UNRELEASED
     HDFS-8521. Add VisibleForTesting annotation to
     BlockPoolSlice#selectReplicaToDelete. (cmccabe)
 
-    HDFS-8540.  Mover should exit with NO_MOVE_BLOCK if no block can be moved.
-    (surendra singh lilhore via szetszwo)
-
   OPTIMIZATIONS
 
   BUG FIXES