[SPARK-17666] Ensure that RecordReaders are closed by data source file scans#15245

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JoshRosen wants to merge 2 commits intoapache:masterfrom

JoshRosen:SPARK-17666-close-recordreader

Commits on Sep 26, 2016

Add close() to RecordReaderIterator and HadoopLinesReader
JoshRosen
committed
Register close() callbacks in all implementations of FileFormat.buildReader()
JoshRosen
committed