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

[srowen]

Phase 1: update plugin versions, test dependencies, some example and third-party versions

[SparkQA]

Test build #51309 has finished for PR 11206 at commit 5ffc0f8.

• This patch fails build dependency tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #51311 has finished for PR 11206 at commit f5f252f.

• This patch fails to build.
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[SparkQA]

Test build #51313 has finished for PR 11206 at commit 1ffe546.

• This patch fails to build.
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• This patch adds no public classes.

[SparkQA]

Test build #51315 has finished for PR 11206 at commit 2303414.

• This patch fails to build.
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• This patch adds no public classes.

[SparkQA]

Test build #51317 has finished for PR 11206 at commit 9224468.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #51322 has finished for PR 11206 at commit bee3d61.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #51360 has finished for PR 11206 at commit cb01590.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[srowen]

Jenkins, retest this please

[SparkQA]

Test build #51368 has finished for PR 11206 at commit cb01590.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[JoshRosen]

If we're going to bump Maven, should we also make sure that we have an enforcer rule which doesn't allow any earlier version of Maven to be used?

[srowen]

It's already in the enforcer rule, but oops, I did not update the expected Maven version in the parent POM. Coming now ...

[SparkQA]

Test build #51432 has finished for PR 11206 at commit 5498896.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[JoshRosen]

These all look like pretty low risk version bumps to me, so I'm going to merge this into master. Thanks Sean!