Basic support for OpenWrt

[macie]

This issue collects items needed for basic support of OpenWrt. The goal is to run lynis without errors on OpenWrt 23.05 (oldest currently supported version).

• [OpenWrt] OS detection & EOL support #1601
• [OpenWrt] Fix hostname detection #1602
• [OpenWrt] Fix HostID and HostID2 creation exceptions #1604
• fix Unknown service manager exception
• support BusyBox ps (fix /bin/ps: unrecognized option: x and /bin/ps: unrecognized option: a errors)

(the list may grow with time)