[SPARK-11315] [YARN] Add YARN extension service to publish Spark events to YARN timeline service#8744

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steveloughran wants to merge 7 commits intoapache:masterfrom

steveloughran:stevel/feature/SPARK-1537-publisher

Commits on Jan 27, 2016

SPARK-1537 SPARK-11315 YarnHistoryService patch applied to latest master (the one with the service API merged in)
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SPARK-11315 scaladoc and import cleanup (minor)
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SPARK-11315 event publisher to add a version counter to every entity request pushed. This is for more reliable polling for changes during integration with YARN-7889
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SPARK-11315 publish entity version counter as number; no need to stringify
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SPARK-11315 ignore BlockUpdated and ExecutorMetricsUpdate events
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SPARK-11315 add info-level logging of post to ATS with entity ID and ATS URL (as info level wasn't giving any details on whether/when entities were published, or under what); downgrade event drop t…
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SPARK-11315 style: methods whose arg list is multiline have newline before first arg
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