TEZ-444.  Rename *.new* packages back to what they should be, remove
dead code from the old packages - mapreduce module (part of TEZ-398).
(sseth)
 Rename *.new* packages back to what they should be, remove dead code
 from the old packages - mapreduce module - tez-engine module (part of
 TEZ-398). (sseth)
TEZ-443.  Merge tez-dag-api and tez-engine-api into a single module -
tez-api (part of TEZ-398). (sseth)