The PGRST000 database connection error message was "Database connection
error. Retrying the connection.", but reconnection attempts are already
logged separately by the reconnection observation, and on fatal errors
(e.g. authentication failure) PostgREST does not retry at all. Drop the
"Retrying the connection." part, leaving "Database connection error.".
The config dump in Config.hs listed db-config, db-pre-config and the
db-pool-* settings out of alphabetical order, while the rest of the dump
was sorted. Now the whole dump is consistently alphabetical and update
the expected IO test configs to match.
