Worker: better handling of backoff when at capacity #791
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When the worker is at capacity, it will now terminate the workloop and stop trying to claim.
Once the server is back to capacity, it'll resume the workloop, resetting the backoff to the initial value.
Logging has also been improved.
I've tested this manually - I'm trying to think of a decent automated test. It is a little hard to quanty the backoffs..
#786