draksetup doesn't set exit codes when operation fails

[psrok1]

Describe the bug

draksetup command doesn't set proper exit code when operation fails.

I've noticed that while debugging misbehaving test that passed this line https://github.com/CERT-Polska/drakvuf-sandbox/blob/master/test/conftest.py#L213 while being unable to download correct snapshot (... placeholder was provided instead of correct name)

[2023-04-07 15:48:42,943][INFO] Downloading installation info
[2023-04-07 15:48:42,945][DEBUG] http://192.168.100.1:8181/ "HEAD /snapshots/.../install.json HTTP/1.1" 404 0
[2023-04-07 15:48:42,945][ERROR] Import failed. Missing files in bucket.
INFO:root:VM provisioned, starting tests...