[SPARK-19239][PySpark] Check parameters whether equals None when specify the column in jdbc API#16599

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libratiger wants to merge 5 commits intoapache:masterfrom

libratiger:pysparkFix

Commits on Jan 16, 2017

[SPARK-19239][PySparK] Check the lowerBound and upperBound whether equal None in jdbc API
DjvuLee
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Commits on Jan 17, 2017

update the None equal comparison
DjvuLee
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Update numPartitions check to keep API consistent
DjvuLee
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Update the document for numPartition
DjvuLee
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Fix the python style
DjvuLee
committed