MAPREDUCE-5079 from trunk. Changes job recovery to restore state directly from job history, instaed of simulating state machine events. Contributed by Jason Lowe and Robert Parker.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1466771 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-0.23' into branch-0.23-gd
Merge remote branch 'origin/branch-0.23-gd' into fb-YAHOO-215-branch-0.23-gd