Set the release date for 2.5.2

(cherry picked from commit 68a050872896f93582f95420dd6e2bdefa4fd7cc)

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

(cherry picked from commit 92de44c2c58321c12bd8796859d54638e3cba9bd)

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

@@ -682,7 +682,7 @@ Release 2.6.0 - 2014-11-15
     HADOOP-11282. Skip NFS TestShellBasedIdMapping tests that are irrelevant on
     Windows. (cnauroth)
 
-Release 2.5.2 - UNRELEASED
+Release 2.5.2 - 2014-11-10
 
   INCOMPATIBLE CHANGES
 

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

@@ -1116,7 +1116,7 @@ Release 2.6.0 - 2014-11-15
     HDFS-7382. DataNode in secure mode may throw NullPointerException if client
     connects before DataNode registers itself with NameNode. (cnauroth)
 
-Release 2.5.2 - UNRELEASED
+Release 2.5.2 - 2014-11-10
 
   INCOMPATIBLE CHANGES
 

hadoop-mapreduce-project/CHANGES.txt

@@ -231,7 +231,7 @@ Release 2.6.0 - 2014-11-15
     MAPREDUCE-5958. Wrong reduce task progress if map output is compressed
     (Emilio Coppa and jlowe via kihwal)
 
-Release 2.5.2 - UNRELEASED
+Release 2.5.2 - 2014-11-10
 
   INCOMPATIBLE CHANGES
 

hadoop-yarn-project/CHANGES.txt

@@ -857,7 +857,7 @@ Release 2.6.0 - 2014-11-15
     consistent with the (somewhat incorrect) behaviour in the non-recovery case.
     (Jian He via vinodkv)
 
-Release 2.5.2 - UNRELEASED
+Release 2.5.2 - 2014-11-10
 
   INCOMPATIBLE CHANGES