catch and raise exceptions from acquire, per #208 #216
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@nigel-gott I threw this together as a way to understand #214, I think they are functionally equivalent. If you agree we can merge your version, as I feel
AquireLockFailure.extend()
isn't very readable and you've actually tested yours. The only other approach I could think of would be to change how celery works somehow and that is a bigger lift than I'd want to tackle.