TEZ-836. Add ConcatenatedKeyValueInput for vertex groups (Gunther Hagleitner via bikas)
TEZ-804. Handle node loss/bad nodes (bikas)
TEZ-756. Allow VertexManagerPlugins to configure RootInputEvents without
access to Tez internal structures. (sseth)
TEZ-840. Default value of DataMovementEventPayloadProto.data_generated
should be true. (sseth)
TEZ-756 Addendum. Fix a unit test failure. (sseth)