[SPARK-21333][Docs] Removed invalid joinTypes from javadoc of Dataset#joinWith#18462

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Commits on Jun 29, 2017

Removed invalid joinTypes from javadoc of Dataset#joinWith
coreywoodfield
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Commits on Jul 4, 2017

Added check for invalid join types in joinWith and tests
coreywoodfield
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Commits on Jul 7, 2017

Added check to make sure correct exception was being caught in test
coreywoodfield
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Analysis exception now contains joinType.sql instead of joinType
coreywoodfield
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