MAPREDUCE-5275. Bring back a couple of APIs in mapreduce.security.TokenCache for binary compatibility with 1.x mapreduce APIs. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1488369 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1488370 13f79535-47bb-0310-9956-ffa450edef68