Preparing for 2.7.3 release: Set the release date for 2.7.3.

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

@@ -1,6 +1,6 @@
 Hadoop Change Log
 
-Release 2.7.3 - UNRELEASED
+Release 2.7.3 - 2016-07-27
 
   INCOMPATIBLE CHANGES
 

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

@@ -1,6 +1,6 @@
 Hadoop HDFS Change Log
 
-Release 2.7.3 - UNRELEASED
+Release 2.7.3 - 2016-07-27
 
   INCOMPATIBLE CHANGES
 

hadoop-mapreduce-project/CHANGES.txt

@@ -1,6 +1,6 @@
 Hadoop MapReduce Change Log
 
-Release 2.7.3 - UNRELEASED
+Release 2.7.3 - 2016-07-27
 
   INCOMPATIBLE CHANGES
 

hadoop-yarn-project/CHANGES.txt

@@ -1,6 +1,6 @@
 Hadoop YARN Change Log
 
-Release 2.7.3 - UNRELEASED
+Release 2.7.3 - 2016-07-27
 
   INCOMPATIBLE CHANGES
 
@@ -176,6 +176,9 @@ Release 2.7.3 - UNRELEASED
     YARN-4686. MiniYARNCluster.start() returns before cluster is completely
     started. (Eric Badger via epayne)
 
+    YARN-5309. Fixed SSLFactory truststore reloader thread leak in
+    TimelineClientImpl. (Weiwei Yang via vvasudev)
+
 Release 2.7.2 - 2016-01-25
 
   INCOMPATIBLE CHANGES