Move aktualizr starting log message
Move aktualizr starting log message

So that it doesn't get printed when calling `aktualizr --version` (for
example)

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