Fix confused handling of replication ports in the DB #420
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It's niche, but if no replication base url was configured and a peer was
configured with a NULL port in the db, then we would try to format None
as an integer and get a TypeError for our troubles.
Equally, if we did specify a port in the DB and did provide a replication URL, the db's port would be ignored---except for logging, which would happily report the wrong port.
Spotted by work in progress elsewhere to make Sydent pass mypy --strict.
Fixes #419.