Celery chord_unlock Loop

[rajadain]

This was always hard to recreate, but can be observed more and more post the Django Upgrade. Usually happens when a lot of Celery Tasks are fired at once, such as when Analyzing a large shape.

In the past this has been remedied by upgrading Celery.

Ensure this is really happening, and once confirmed, remedy it.

[rajadain]

I've tried running very large shapes, subbasin on a HUC-8, drawing large custom shapes, and have been unable to reproduce the chord_unlock behavior. It is possible that the occurrences observed during the upgrade were caused by the interstitial states of the VMs, and now that everything is upgraded and provisioned the behavior is gone.

[rajadain]

Moving this to Verified until it resurfaces again.