[SPARK-16533][CORE] - backport driver deadlock fix to 2.0#14933

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angolon wants to merge 2 commits intoapache:branch-2.0from

angolon:SPARK-16533-2.0

Commits on Sep 2, 2016

[SPARK-16533][CORE] resolve deadlocking in driver when executors die
angolon
committed
[SPARK-16533][HOTFIX] Fix compilation on Scala 2.10.

Marcelo Vanzin
authored and
angolon
committed