Reduce repetitive logging to debug level.
Reduce repetitive logging to debug level.

Also include the serial to make it somewhat more useful.

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

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