HADOOP-10566. Add toLowerCase support to auth_to_local rules for service name. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1593106 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10556. [FIXING JIRA NUMBER TYPO] Add toLowerCase support to auth_to_local rules for service name. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1593108 13f79535-47bb-0310-9956-ffa450edef68