Remove test directory after use.
Remove test directory after use.

This is really helpful if switching between running tests as root and
non-root. Otherwise, root will leave a directory that non-root cannot
use.

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