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

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

This commit was generated by cvs2svn to compensate for changes in r37074,
which included commits to RCS files with non-trunk default branches.

Import trimmed version of ipfilter 3.2.7.

Obtained from: Darren Reed via http://cheops.anu.edu.au/~avalon/

Import IP Filter v3.1.7 into FreeBSD tree