[patch] allow testing VIMAGE with pf in base system only

[G. Paul Ziemba]

julian at elischer.org (Julian Elischer) writes:

>there is a version of pf in the wings that actually knows about jails.
>This change is not to be confused with that.

I was worried that the pf/vimage project was stalled. I eagerly await!
-- 
G. Paul Ziemba
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