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

Moved CHANGES.txt entry to 2.6.1

(cherry picked from commit e7aa81394dce61cc96d480e21204263a5f2ed153)

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

@@ -708,8 +708,6 @@ Release 2.7.0 - 2015-04-20
 
     HADOOP-10563. Remove the dependency of jsp in trunk. (wheat9)
 
-    HADOOP-10786. Fix UGI#reloginFromKeytab on Java 8. (Stephen Chu via wheat9)
-
     HADOOP-11291. Log the cause of SASL connection failures.
     (Stephen Chu via cnauroth)