[SPARK-16961][CORE] Fixed off-by-one error that biased randomizeInPlace#14551

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nicklavers wants to merge 8 commits intoapache:masterfrom

VideoAmp:SPARK-16961-randomizeInPlace

Commits on Aug 9, 2016

Fixed off-by-one error that biased randomizeInPlace against keeping elements in place; added a seeded unit test for statistical significance
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style changes
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Commits on Aug 11, 2016

changed seeds to pass tests
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Commits on Aug 17, 2016

changed expected output for show() method
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