[SPARK-25406][SQL] For ParquetSchemaPruningSuite.scala, move calls to `withSQLConf` inside calls to `test`#22394

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mallman wants to merge 3 commits intoapache:masterfrom

VideoAmp:spark-25406-fix_broken_schema_pruning_tests

Commits on Sep 11, 2018

For ParquetSchemaPruningSuite.scala, move calls to `withSQLConf` inside
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We shouldn't expect queries selecting columns using different case to
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Commits on Sep 12, 2018

Clarify the intent of the test methods for case-insensitive pruning
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