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

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piaozhexiu wants to merge 7 commits intoapache:masterfrom

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
committed
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