Allow batches 30s of cleanup time on external kills #984
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If a batch is killed by Tron (i.e., hitting max_runtime) or a human (i.e., tronctl kill), give them 30s to handle any cleanup.
Batches that wish to use this feature will need to catch the SIGTERM signal and do whatever cleanup they'd like to do in that handler :)
NOTE: this requires Yelp/task_processing#218