Bug#1038901: xen dom0 erroneous detected as 'xen' virtualization by systemd-detect-virt

[zithro]

Hello,

I reported the bug upstream, just added there some comments to reflect 
that the output is different on AMD and Intel platforms.
I also added the commit link, thanks for that.

So, "systemd-detect-virt" on non-nested dom0s reports :
- "xen" on Intel (like this bug report)
- "vm-other" on AMD (like my bug report upstream)