Update CHANGES.txt for HADOOP-9476

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1511141 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -12,6 +12,9 @@ Release 0.23.10 - UNRELEASED
 
     HADOOP-9748. Reduce blocking on UGI.ensureInitialized (daryn)
 
+    HADOOP-9476. Some test cases in TestUserGroupInformation fail if ran after
+    testSetLoginUser. (Robert Parker via kihwal)
+
   BUG FIXES
 
 Release 0.23.9 - 2013-07-08