[SPARK-3369] [CORE] [STREAMING] Java mapPartitions Iterator->Iterable is inconsistent with Scala's Iterator->Iterator#10413

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Commits on Jan 8, 2016

Fix Java function API methods for flatMap and mapPartitions to require producing only an Iterator, not Iterable. Also fix DStream.flatMap to require a function producing TraversableOnce only, not T…
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Fix compile error
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