Improvements to the ipfw rc scripts.

[Vulpes Velox]

Here are some patches that add in the ability to save current ipfw
rules and recall them. It saves it to /var/db/ipfw/. A save with .6
after it is for ip6fw. By default last is used. A name can be
specified as well.

ipfw save moose will create /var/db/ipfw/moose.
ipfw start moose will start ipfw using /var/db/ipfw/moose.
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