[SPARK-14650][REPL][BUILD] Compile Spark REPL for Scala 2.12#19612

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srowen:SPARK-14650.2

Commits on Oct 30, 2017

Spark REPL changes for Scala 2.12.4: use command(), not processLine() in ILoop; remove direct dependence on older jline
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Still manage up jline version for SPARK-16770 in 2.11
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