[CFR] unified rc.firewall

[Hajimu UMEMOTO]

Hi,

The ipfw and ip6fw were unified into ipfw2, now.  But, we still have
rc.firewall and rc.firewall6.  However, there are conflicts with each
other, and it confuses the users, IMHO.
So, I made a patch to unify rc.firewall and rc.firewall6, and obsolete
rc.firewall6 and rc.d/ip6fw.
Please review the attached patch.  If there is no objection, I'll
commit it in next weekend.

Sincerely,
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--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume at mahoroba.org  ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/