MAPREDUCE-5222. Bring back some methods and constants in Jobclient for binary compatibility with mapred in 1.x. Contributed by Karthik Kambatla.
svn merge --ignore-ancestry -c 1482208 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1482209 13f79535-47bb-0310-9956-ffa450edef68