In case of LPAR installation it's possible that the cmd: systemd-detect-virt --vm might return an exitCode < 0 even if logged into the booted VM and executed from cmdline returns "none" without an errorcode.

This leads to an abort of further processing in system_vendor.go and Manufacturer will not be set to IBM/S390.

To fix this glitch, the code to determine the Manufacturer should be moved before the call for systemd-detect-virt --vm cmd.