[SPARK-13324] [CORE] [BUILD] Update plugin, test, example dependencies for 2.x#11206

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srowen wants to merge 4 commits intoapache:masterfrom

srowen:SPARK-13324

Commits on Feb 15, 2016

Phase 1: update plugin versions, test dependencies, some example and third-party versions
srowen
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Back off Selenium to avoid Jetty version problem
srowen
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Commits on Feb 16, 2016

Resolve scalatest / scalacheck incompatibility
srowen
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Commits on Feb 17, 2016

Require Maven 3.3.9 in build
srowen
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