Proper implementation of TST-156.
Proper implementation of TST-156.

Verify that the primary and secondary ECU Serial numbers and keys don't
change when Aktualizr is restarted.

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