[SPARK-22308] Support alternative unit testing styles in external applications#19529

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nkronenfeld wants to merge 13 commits intoapache:masterfrom

nkronenfeld:alternative-style-tests-2

Commits on Oct 18, 2017

Better documentation of testing procedures
nkronenfeld
committed
Same initialization issue in SharedSparkContext as is in SharedSparkSession
nkronenfeld
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Commits on Oct 23, 2017

Remove documentation of testing
nkronenfeld
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Commits on Oct 24, 2017

Move base versions of PlanTest and SQLTestUtils into the same file as where they came from, in an attempt to make diffs simpler
nkronenfeld
committed

Commits on Oct 25, 2017

Commits on Oct 26, 2017