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Make sure an error is returned straight away if there's contention on
the underlying db file. This makes sure we don't reintroduce the issue
fixed in d21d088, and it will help detect contention in parallelized
tests if they're badly written. It effectively adds a new error mode to
the daemon, but if anyone faces this error, they should fix their
process manager.
Signed-off-by: Albin Kerouanton <albinker@gmail.com>