[SPARK-25921][PySpark] Fix barrier task run without BarrierTaskContext while python worker reuse#22962

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xuanyuanking wants to merge 2 commits intoapache:masterfrom xuanyuanking:SPARK-25921

+17-2

Commits on Nov 7, 2018

fix BarrierTaskContext while python worker reuse
xuanyuanking
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Commits on Nov 12, 2018

UT enhance and address comment
xuanyuanking
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