Add missing CHANGES.txt entry for HDFS-8767.

(cherry picked from commit e50dd19a9c816c81c64fff8b958f4036dcb98822)

Conflicts:

	hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
(cherry picked from commit 62eabec549ef13ac7e6ed517ef628b5b01d0ab77)

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

@@ -157,6 +157,11 @@ Release 2.7.2 - UNRELEASED
     HDFS-9445. Datanode may deadlock while handling a bad volume.
     (Wlater Su via Kihwal)
 
+Release 2.7.1 - 2015-07-06
+
+    HDFS-8767. RawLocalFileSystem.listStatus() returns null for UNIX pipefile.
+    (Kanaka Kumar Avvaru via wheat9)
+
 Release 2.7.1 - 2015-07-06
 
   INCOMPATIBLE CHANGES