[SPARK-20774][SPARK-27036][SQL] Cancel the running broadcast execution on BroadcastTimeout#24595

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jiangxb1987 wants to merge 3 commits intoapache:masterfrom

jiangxb1987:SPARK-20774

Commits on May 13, 2019

cancel timeout broadcast execution
jiangxb1987
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Commits on May 14, 2019

address comments
jiangxb1987
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Commits on May 15, 2019

fix broadcastTimeout = -1 problem
jiangxb1987
committed