[DO-NOT-MERGE] Investigate if PR 18320 causes R tests flaky#18456

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Commits on Jun 28, 2017

Revert "[SPARK-21093][R] Terminate R's worker processes in the parent of R's daemon to prevent a leak"
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Revert "Revert "[SPARK-21093][R] Terminate R's worker processes in the parent of R's daemon to prevent a leak""
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R tests only
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