Implement comments embedded into ipfw2 instructions.
Implement comments embedded into ipfw2 instructions.

Since we already had 'O_NOP' instructions which always match, all
I needed to do is allow the NOP command to have arbitrary length
(i.e. move its label in a different part of the switch() which
validates instructions).

The kernel must know nothing about comments, everything else is
done in userland (which will be described in the upcoming ipfw2.c
commit).

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