Netflix / genie / 2243

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master: 94%

Pull #853

travis-ci

Switch to using 'kill -0' on UNIX to check on job children processes

Using 'ps' to check for process termination can sometimes produce false-negatives.
I.e. returning with non-zero exit code when the process is actually still running.
This situation can lead Genie to mark a job as failed when it was actually still running.
Switch to using 'kill -0' as per POSIX recommendation.

Also refactor and create a new ProcessChecker.Factory bean, rather than having users of ProcessChecker instantiate one directly.

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