[SPARK-10001] [CORE] Allow Ctrl-C in spark-shell to kill running job#8216

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piaozhexiu:SPARK-10001

Commits on Sep 12, 2015

Add signal handler to JobWaiter to handle ctrl-c
Cheolsoo Park
committed
Invoke Signal.handle via reflection
Cheolsoo Park
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Revert "Invoke Signal.handle via reflection"
Cheolsoo Park
committed
Fix import ordering
Cheolsoo Park
committed
Remove SignalHanlder parameter from detachSigintHandler
Cheolsoo Park
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Fix unit tests
Cheolsoo Park
committed
Code clean up using scala try, success, and failure
Cheolsoo Park
committed