use normal restart signal (#3318)
use normal restart signal (#3318)

non-clustered mode requires a different restart signal, https://github.com/puma/puma/blob/master/docs/restart.md#restarts

this will be for local / dev restarts as deployment will use K8s rolling restart instead https://github.com/zooniverse/panoptes/pull/3315#issuecomment-631511492
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