HIVE-6255: Change Hive to not pass MRSplitsProto in MRHelpers.createMRInputPayloadWithGrouping (Thejas M Nair via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/tez@1564156 13f79535-47bb-0310-9956-ffa450edef68