Release process for 2.7.1: Set the release date for 2.7.1.

(cherry picked from commit bf89ddb9b8ca27a34074b415f85599dd48b8fc50)
diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 4f87382..f0400bc 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -12,7 +12,7 @@
 
   BUG FIXES
 
-Release 2.7.1 - 2015-06-28
+Release 2.7.1 - 2015-07-06 
 
   INCOMPATIBLE CHANGES
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index abea6cd..a4282a5 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -12,7 +12,7 @@
 
   BUG FIXES
 
-Release 2.7.1 - 2015-06-28
+Release 2.7.1 - 2015-07-06 
 
   INCOMPATIBLE CHANGES
 
diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 3cb18ef..a4b8d81 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -12,7 +12,7 @@
 
   BUG FIXES
 
-Release 2.7.1 - 2015-06-28
+Release 2.7.1 - 2015-07-06 
 
   INCOMPATIBLE CHANGES
 
diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index b41024c..450ec672 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -12,7 +12,7 @@
 
   BUG FIXES
 
-Release 2.7.1 - 2015-06-28
+Release 2.7.1 - 2015-07-06 
 
   INCOMPATIBLE CHANGES