[SPARK-22066][BUILD] Update checkstyle to 8.2, enable it, fix violations#19282

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srowen wants to merge 2 commits intoapache:masterfrom

srowen:SPARK-22066

Commits on Sep 19, 2017

Update plugins, including scala-maven-plugin, to latest versions. Update checkstyle to 8.2. Remove bogus checkstyle config and enable it. Fix existing and new Java checkstyle errors.
srowen
committed
Undo inadvertent R doc change
srowen
committed