SPARK-6338 [CORE] Use standard temp dir mechanisms in tests to avoid orphaned temp files#5029

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srowen:SPARK-6338

Commits on Mar 16, 2015

Use Utils.createTempDir() to replace other temp file mechanisms used in some tests, to further ensure they are cleaned up, and simplify
srowen
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Commits on Mar 17, 2015

Revert some added recursive-delete calls
srowen
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Commits on Mar 19, 2015