Updating for 0.23.7 release

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1469560 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -18,7 +18,7 @@ Release 0.23.8 - UNRELEASED
     HADOOP-9233. Cover package org.apache.hadoop.io.compress.zlib with unit
     tests (Vadim Bondarev via jlowe)
 
-Release 0.23.7 - UNRELEASED
+Release 0.23.7 - 2013-04-18
 
   INCOMPATIBLE CHANGES
 

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

@@ -14,7 +14,7 @@ Release 0.23.8 - UNRELEASED
     HDFS-4690. Namenode exits if entering safemode while secret manager is 
     edit logging (daryn via kihwal)
 
-Release 0.23.7 - UNRELEASED
+Release 0.23.7 - 2013-04-18
 
   INCOMPATIBLE CHANGES
 

hadoop-mapreduce-project/CHANGES.txt

@@ -21,7 +21,7 @@ Release 0.23.8 - UNRELEASED
     MAPREDUCE-4383. HadoopPipes.cc needs to include unistd.h.
     (Andy Isaacson via tgraves)
 
-Release 0.23.7 - UNRELEASED
+Release 0.23.7 - 2013-04-18
 
   INCOMPATIBLE CHANGES
 

hadoop-yarn-project/CHANGES.txt

@@ -12,7 +12,7 @@ Release 0.23.8 - UNRELEASED
  
   BUG FIXES
 
-Release 0.23.7 - UNRELEASED
+Release 0.23.7 - 2013-04-18
 
   INCOMPATIBLE CHANGES