[SPARK-23776][python][test] Check for needed components/files before running pyspark-sql tests#20909

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bersprockets wants to merge 7 commits intoapache:masterfrom

bersprockets:SPARK-23776

Commits on Mar 23, 2018

initial commit: check for test udf and hive assembly
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Commits on Mar 29, 2018

Commits on Mar 30, 2018

Skip HiveSparkSubmitTests if Hive not available
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Commits on Apr 3, 2018