Run processes in new process groups, kill process group instead of process #1
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Some processes are getting orphaned when running Foreman with JRuby.
Creating a new pgroup allows them all to be killed together.
I believe the issue is related to how JRuby handles `Dir.chdir` by
creating a shell process: `sh -c 'cd /chdir/target; ${command}'`. That
causes a second process to be created that won't get cleaned up by
killing the parent.
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This is ddollar#780 but for this repo, original description below
This is ddollar#723 but rebased against master today. Credit to @davishmcclurg for suggesting those changes in the first place.
I think this change also addresses ddollar#779. It makes Foreman match what Honcho does, and Honcho does not exhibit the problem shown in ddollar#779.
Close ddollar#779
(Some additional background: There was an earlier PR ddollar#528 that did half of what this PR does, ddollar#525 was closed after that was merged, but then the PR was reverted after a few days, could not find the reason for that).