Commits on Sep 14, 2020

1. Mark task as failed when it fails sending in Celery …

   If a task failed hard on celery, _before_ being able to execute the
   airflow code the task would end up stuck in queued state. This change
   makes it get retried.
   
   This was discovered in load testing the HA work (but unrelated to HA
   changes), where I swamped the kube-dns pod, meaning the worker was
   sometimes unable to resolve the db name via DNS, so the state in the DB
   was never updated

   

   ashb committed Sep 14, 2020
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