Completely rewrite handling of protocol field for firewalls, things are

now completely consistent across all IP protocols and should be quite a
bit faster.

Use getprotoname() extensively, performed minor cleanups of admin utility.
The admin utility could use a good kick in the pants.

Basicly, these were the minimal changes I could make to the code
to get it up to tollerable shape.  There will be some future commits
to clean up the basic architecture of the firewall code, and if
I'm feeling ambitious, I may pull in changes like NAT from Linux
and make the firewall hooks comletely generic so that a user can
either load the ipfw module or the ipfilter module (cf Darren Reed).

Discussed with: fenner & alex

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