* Applies peer-scoped lock to peer task handler.
* Replace async lock with delete-first approach.
* Cleanup some logging
* Adds inFlight flag to WantListEntry
* Clears inflight flag when local retrieval fails.
* Adds test for setting of in-flight
* Adds test for clearing in-flight when lookup fails
* Review comments by Tomasz
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Co-authored-by: gmega <giuliano.mega@gmail.com>
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