[SPARK-18280][Core]Fix potential deadlock in `StandaloneSchedulerBackend.dead`#15775

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zsxwing:SPARK-18280

Commits on Nov 4, 2016

Fix potential deadlock in `StandaloneSchedulerBackend.dead`
zsxwing
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Commits on Nov 7, 2016

Add a thread local flag for RPC threads and run 'stop' in a new thread automatically
zsxwing
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