[SPARK-21578][CORE] Add JavaSparkContextSuite#18778

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dongjoon-hyun:SPARK-21578

Commits on Jul 30, 2017

[SPARK-21578][CORE] Consolidate redundant SparkContext constructors due to SI-8479
dongjoon-hyun
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Commits on Jul 31, 2017

Fix outdate comments and add explicit testsuite.
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