[SPARK-22897][CORE]: Expose stageAttemptId in TaskContext#20082

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advancedxy:SPARK-22897

Commits on Dec 26, 2017

Commits on Dec 27, 2017

Commits on Dec 28, 2017

Add override for stageId, stageAttemptId and partitionId.
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Commits on Dec 29, 2017

Rename stageAttemptId to stageAttemptNumber
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