Kernel, Distro, VM, Perl, Systemic and Compiler should be tested properly

[AlexDaniel]

We had this doc issue and eventually all of these were documented (I think the reasoning for that is that some of them are tested indirectly through $*PERL). We need to test these classes properly.

• Kernel
• Distro
• VM
• Perl
• Systemic
• Compiler

[Kaiepi]

$*DISTRO was bugging me for a while since it's missing some info for metadata on the more obscure platforms. I can throw up some VMs to get DragonFlyBSD, FreeBSD, OpenBSD, NetBSD, and Solaris on there.

[Kaiepi]

Only note: these systems often don't share some of their metadata very clearly

[JJ]

Curiously enough, there's a "dragonfly" in there already. Not tested, though.