Improve logging during database initialization.
Improve logging during database initialization.

If the ECU serial is not found, that isn't necessarily an error. During
initialization, it is in fact expected.

Signed-off-by: Patrick Vacek <a38520cbbe2e974bc8b7ea86877dd3c7115ca2d7@gmail.com>

advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr