[SPARK-19534][TESTS] Convert Java tests to use lambdas, Java 8 features#16964

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srowen wants to merge 3 commits intoapache:masterfrom

srowen:SPARK-19534

Commits on Feb 16, 2017

Convert tests to use Java 8 lambdas, and modest related fixes to surrounding code
srowen
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Additional simplification: remove Guava classes and unneeded types
srowen
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Commits on Feb 18, 2017

Remove obsolete test and fix some style issues per review
srowen
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