[SPARK-17834][SQL]Fetch the earliest offsets manually in KafkaSource instead of counting on KafkaConsumer#15397

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zsxwing wants to merge 3 commits intoapache:masterfrom zsxwing:SPARK-17834

+48-26

Commits on Oct 7, 2016

Fetch the earliest offsets manually in KafkaSource instead of counting on KafkaConsumer
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Commits on Oct 12, 2016

clean up
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Commits on Oct 13, 2016

Address
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