Revert "Adding release 2.7.1 to CHANGES.txt" from branch-2.7.0.

This reverts commit 2b44fcaa53846087e34544ea355c364d59dff408.

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

@@ -1,17 +1,5 @@
 Hadoop Change Log
 
-Release 2.7.1 - UNRELEASED
-
-  INCOMPATIBLE CHANGES
-
-  NEW FEATURES
-
-  IMPROVEMENTS
-
-  OPTIMIZATIONS
-
-  BUG FIXES
-
 Release 2.7.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -1,17 +1,5 @@
 Hadoop HDFS Change Log
 
-Release 2.7.1 - UNRELEASED
-
-  INCOMPATIBLE CHANGES
-
-  NEW FEATURES
-
-  IMPROVEMENTS
-
-  OPTIMIZATIONS
-
-  BUG FIXES
-
 Release 2.7.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/CHANGES.txt

@@ -1,17 +1,5 @@
 Hadoop MapReduce Change Log
 
-Release 2.7.1 - UNRELEASED
-
-  INCOMPATIBLE CHANGES
-
-  NEW FEATURES
-
-  IMPROVEMENTS
-
-  OPTIMIZATIONS
-
-  BUG FIXES
-
 Release 2.7.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/CHANGES.txt

@@ -1,17 +1,5 @@
 Hadoop YARN Change Log
 
-Release 2.7.1 - UNRELEASED
-
-  INCOMPATIBLE CHANGES
-
-  NEW FEATURES
-
-  IMPROVEMENTS
-
-  OPTIMIZATIONS
-
-  BUG FIXES
-
 Release 2.7.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES