Add missing CHANGES.txt entry for HDFS-8767.

(cherry picked from commit e50dd19a9c816c81c64fff8b958f4036dcb98822)

Conflicts:

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

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

@@ -1834,6 +1834,11 @@ Release 2.7.2 - UNRELEASED
     HDFS-8326. Documentation about when checkpoints are run is out of date.
     (Misty Stanley-Jones via xyao)
 
+    HDFS-8767. RawLocalFileSystem.listStatus() returns null for UNIX pipefile.
+    (Kanaka Kumar Avvaru via wheat9)
+
+Release 2.7.1 - 2015-07-06
+
   INCOMPATIBLE CHANGES
 
   NEW FEATURES