More pf work

[Jan Lentfer <Jan.Lentfer@xxxxxx>]

My work on updating pf is still ongoing and I have reached a new 
milestone: Updated kernel part to the version that comes with OpenBSD 4.4.

So far the module builds and loads (no panics so far), but I still need 
to update pfctl to effectively start testing.

Anyway I wanted to make this public so the code can be reviewed already now:

http://gitweb.dragonflybsd.org/~lentferj/dragonfly.git/shortlog/refs/heads/pf44

Jan