[SPARK-16182] [CORE] Utils.scala -- terminateProcess() should call Process.destroyForcibly() if and only if Process.destroy() fails#13973

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Commits on Jun 29, 2016

Utils.terminateProcess should destroy() first and only fall back to destroyForcibly() if it fails. Utils.waitForProcess should use Java 8 method if available.
srowen
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