CFR: VIMAGE + pf bugfix

[Martin Matuska]

Hi,

please review my attached patch. It fixes two panics and makes PF usable
with VIMAGE (inside host system only).

http://people.freebsd.org/~mm/patches/pf_mtag_taskq.patch

The patch does the following:
a) devirtualizes the UMA zone for pf_mtag
b) adds vnet information to pf_overload_task

Thank you,
mm
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