MAPREDUCE-1566. Adds a configuration attribute using which job clients can specify a credentials file. The tokens from there will be passed to the job. Contributed by Jitendra Pandey and Owen O'Malley.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/mapreduce/trunk@966918 13f79535-47bb-0310-9956-ffa450edef68
7 files changed