YARN-2319. Made the MiniKdc instance start/close before/after the class of TestRMWebServicesDelegationTokens. Contributed by Wenwu Peng.
svn merge --ignore-ancestry -c 1612588 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.5@1612592 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10864: Merging r1612610 from branch-2 to branch-2.5.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.5@1612611 13f79535-47bb-0310-9956-ffa450edef68