fix: Distinguish restore of provisioned and unprovisioned device
Devices in unprovisioned state do not require authentication, as there
are no users yet.
Previously, the nethsm tool would require providing credentials to the
command when restoring from backup, even if the targeted device was in
unprovisioned state.
This changes the nethsm system restore subcommand to first check the
device's state and only then require authentication if the device is in
operational state.
Fixes #25 (closed)
Edited by David Runge