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Support gracefully stopping Atlantis. When Atlantis receives a SIGTERM or SIGINT it will not shut down immediately but instead wait for in-progress operations to complete. New operations will be refused and Atlantis will comment back that "Atlantis is shutting down...". Once all in-progress operations are complete, Atlantis will exit.
Takes @benoit74's amazing work from #953 and refactors to use signals and remove
atlantis drain
command.Fixes #320