Revert "[SPARK-24418][BUILD] Upgrade Scala to 2.11.12 and 2.12.6"#22160

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dbtsai wants to merge 1 commit intoapache:masterfrom dbtsai:revert

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Commits on Aug 20, 2018

Revert "[SPARK-24418][BUILD] Upgrade Scala to 2.11.12 and 2.12.6"
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