Fix resolution of the virtual
fact on FreeBSD
#2744
Draft
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We should not call Linux-specific code from a non-Linux system. Before #2743, the Linux-specific code was unexpectedly loaded, and the Linux resolver was non-functional on FreeBSD, causing a warning to be output. With #2743, the Linux specific code is not loaded anymore, breaking further the fact resolution.
In order to fix this, the virtual_detector code needs to either be split into platform-specific pieces, or take care to only call platform-specific code on these platforms. Given this is a utility class, I chose the second route, and since the Linux-specific code is now only loaded on Linux, rely on the namespace existing or not to determine if we should run that code.
This is part 2/2 of a fix of #2742