[Logs] Avoid transaction/solution already exists warnings
#4015
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Motivation
I commonly see warnings like the following while testing:
This seems totally benign, and logging a warning may confuse users.
Proposed change
The change in this PR is very similar to #3981. The relevant functions now return
Ok(false). For a valid transaction/solution that already exist in the mempool, in which case nodes print a debug message instead of a warning.Notes
The change set is a little bigger as the channels require quite a bit of boilerplate. I hope we can eventually merge something like #3858 to simplify this.