[MINOR][SS] Fix kafka-0-10-sql trivials#22342

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dongjinleekr wants to merge 3 commits intoapache:masterfrom

dongjinleekr:feature/fix-kafka-sql-trivials

Commits on Sep 5, 2018

Remove unused import from KafkaRelation
dongjinleekr
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Remove unused import from KafkaOffsetRangeCalculator
dongjinleekr
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Fix comments on KafkaStreamWriterFactory: it does not extend DataWriterFactory from commit e754887.
dongjinleekr
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