[Spark-20087][CORE] Attach accumulators / metrics to 'TaskKilled' end reason#21165

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advancedxy wants to merge 11 commits intoapache:masterfrom

advancedxy:SPARK-20087

Commits on Apr 28, 2018

Add document for semantic change of accumulator.
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Commits on May 14, 2018

Revert document and fix compile error
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Commits on May 15, 2018

Update MimaExcludes to ignore TaskKilled incompatible change.
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Commits on May 21, 2018

Avoid copy call when constructing TaskKilled.
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