Merge #2876 #2924

2876: DNS subscription refactor for A/AAAA lookup r=coot a=Infinisil

While looking into that code I noticed that I could be improved a bit. This includes:
- Removing the need for any extra `TMVar`'s and `TVar`'s
- Previously only exceptions for the first thread to finish were caught and logged. Now exceptions for both threads are caught
- Simplify the code for more readability

Other than all thread exceptions now being caught, this is only a refactoring without any functional change. To convince myself of the correctness of this change, I split the changes into smallish commits, which should relatively easily be verifiable for equivalence.

2924: Tracing improvements r=coot a=coot

- mini-protocols: trace termination message
- tx-submission-inbound: improved logging


Co-authored-by: Silvan Mosberger <[email protected]>
Co-authored-by: Marcin Szamotulski <[email protected]>

Author: 3 people