db-delay with reservations database "imagines" database connection
After #3300 (closed) fix, there is still a problem left:
When using the reservations database, Kea detects that there is no database and states that it is the first of 5 retries.
Then reports database connection lost
and immediately reports database connection recovered.
(line 35 in log) (but the database is shut down) and proceeds like it has a database (so it serves traffic, etc.)
reproducable on v4, v6, MySQL and postgr