fuel, armband: Sync deploy scripts, cleanup

fuel, armband: Sync deploy scripts, cleanup

Run shellcheck on touched files, fix minor warnings.
Prepare for upcoming changes:
- ISO artifact will be obsoleted (later);
- Fuel and Armband should use the same deploy script;

Fuel:
- rename securedlab local copy to lab-config;

Armband:
- drop deploy cache, Danube jobs can work without it, master/next
  jobs no longer use it;
- move TMPDIR to $HOME (was in $WORKSPACE), so it's persistent;

Change-Id: I9f8c47f9ca50de3c53c62ca6a08df0cc3a73abd3
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>