[SPARK-14280][BUILD][WIP] Update change-version.sh and pom.xml to add Scala 2.12 profiles and enable 2.12 compilation#18645

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Commits on Aug 30, 2017

Update dependencies where needed to minimum that offers a Scala 2.12 build; fix some things that will be warnings or errors in 2.12; restore Scala 2.12 profile infrastructure
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