Try to ensure we are logged into a Unix system before proceeding too far
dmidecode return nothing on some virtual systems, check for this.
Merge branch 'detect-non-unix' of https://github.com/spkane/Device42-AutoDiscovery-Scripts into dejan-detect-non-unix
Version 1.2.0. with non-unix detection and few other checks.
Merge branch 'dejan-detect-non-unix'