Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Update packet filter (pf) code to OpenBSD 4.5.

You need to update userland (world and ports) tools
to be in sync with the kernel.

Submitted by: mlaier
Submitted by: eri

This commit was generated by cvs2svn to compensate for changes in r145837,
which included commits to RCS files with non-trunk default branches.

Import pf userland from OpenBSD 3.7 (OPENBSD_3_7 as of today)

Vendor import of OpenBSD's pf userland as of OpenBSD 3.4

Approved by: bms(mentor), core(in general)