[SPARK-9026] [SPARK-4514] Modifications to JobWaiter, FutureAction, and AsyncRDDActions to support non-blocking operation#9264

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reggert wants to merge 29 commits intoapache:masterfrom

reggert:fix-futureaction

Commits on Oct 24, 2015

reworked FutureAction and JobWaiter to avoid blocking or consuming threads while waiting for jobs
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reworked ComplexFutureAction and AsyncRDDActions.takeAsync to be non-blocking
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corrected issues flagged by scalastyle
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Commits on Nov 7, 2015

Commits on Nov 10, 2015

Commits on Nov 11, 2015

Commits on Nov 12, 2015

added an assertion to verify that future completed properly
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Commits on Nov 14, 2015

Commits on Nov 17, 2015

Commits on Nov 21, 2015

created reusable Smuggle construct to allow unserializable objects to be 'smuggled' into tasks for testing purposes, and refactored AsyncRDDActionsSuite to make use of it
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Commits on Nov 22, 2015

Commits on Dec 13, 2015

removed inaccurate comment line from AsyncRDDActionsSuite
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