HADOOP-12475. Move attribution to 2.8.0 section of CHANGES.txt.

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

@@ -510,9 +510,6 @@ Trunk (Unreleased)
     HADOOP-12364. Deleting pid file after stop is causing the daemons to
     keep restarting (Siqi Li via aw)
 
-    HADOOP-12475. Replace guava Cache with ConcurrentHashMap for caching
-    Connection in ipc Client (Walter Su via sjlee)
-
   OPTIMIZATIONS
 
     HADOOP-7761. Improve the performance of raw comparisons. (todd)
@@ -1228,6 +1225,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-12478. Shell.getWinUtilsPath() has been renamed
     Shell.getWinutilsPath(). (stevel)
 
+    HADOOP-12475. Replace guava Cache with ConcurrentHashMap for caching
+    Connection in ipc Client (Walter Su via sjlee)
+
   OPTIMIZATIONS
 
     HADOOP-12051. ProtobufRpcEngine.invoke() should use Exception.toString()