Celery warm shutdown on supervisord

[alfg]

When supervisor restarts/shutdown the celery task, it will send the TERM sigkill signal, which kills the process and loses any working/scheduled tasks. Need to modify supervisord.conf to add the stopsignal=INT parameter.

• http://supervisord.org/configuration.html
• http://stackoverflow.com/questions/23723324/workerlosterror-when-stopping-celery-worker-from-supervisor
• https://github.com/celery/celery/blob/3.1/extra/supervisord/celeryd.conf