Exposing VM detection as sysctl

[Ivan Voras]

Moving discussion from src-committers
(<9bbcef730812081122r2b1fb938s6201aeee7756b884 at mail.gmail.com>):

Any objections to the patch:

http://people.freebsd.org/~ivoras/diffs/subr_param.c.diff.txt

?

(Of course, for symmetry, if we ever support any hosting for full
virtualization or even for our monsters like vimage, another sysctl
might be introduced as a bitmap that describes VM hosting abilities).

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