Richard van der Hoff 0cb72812f9
Fix stack overflow in Keyring (#5724)
* Refactor Keyring._start_key_lookups

There's an awful lot of deferreds and dictionaries flying around here. The
whole thing can be made much simpler and achieve the same effect.

* Add a delay to key lookup lock release to fix stack overflow

A tactical call_later here should fix #5723

* changelog
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