[SPARKR][SPARK-22344] Set java.io.tmpdir for SparkR tests#19589

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shivaram wants to merge 2 commits intoapache:masterfrom

shivaram:sparkr-tmpdir-clean

Commits on Oct 27, 2017

Set java.io.tmpdir for CRAN checks
shivaram
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Commits on Oct 28, 2017

Address comments
shivaram
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