HADOOP-10786. Fix UGI#reloginFromKeytab on Java 8. Contributed by Stephen Chu.

Moved CHANGES.txt entry to 2.6.1

(cherry picked from commit d6050f06a3b7e049541b1cb4597c388abf00a5be)

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

@@ -1407,6 +1407,8 @@ Release 2.6.1 - UNRELEASED
     architecture because it is slower there (Suman Somasundar via Colin P.
     McCabe)
 
+    HADOOP-10786. Fix UGI#reloginFromKeytab on Java 8. (Stephen Chu via wheat9)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES