support register shuffle task in map partition mode

[Shuang]

Abstract

Make each partition location data can be grouped by (partitionId, attemptId) as partition result group is the necessary step to support map partition, because with each map attempt task a new set of results would be generated. Then we can support register map partition task. The image below will demonstrate this

Implements

1. encode partitionId[Int] = (attemptId 8bit, rawPartitionId 24 bit)
2. The epoch of each group will be managed by their own partition id as before and map/reduce partition use the same way.
3. support register shuffle task in map partition mode(first time will offer and reserve all slots for attemptId=0 task)