[SPARK-20713][Spark Core] Convert CommitDenied to TaskKilled.#18070

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lycplus wants to merge 5 commits intoapache:masterfrom

lycplus:SPARK-20713

Commits on May 23, 2017

Convert CommitDenied to TaskKilled.
lycplus
committed

Commits on May 26, 2017

Commits on May 27, 2017

Update toTaskFailedReason to TaskCommitDeniedReason.
lycplus
committed

Commits on Jun 2, 2017

Let TaskCommitDenied extends TaskKilled.
lycplus
committed