mlaier f5cde2819f Import interface groups from OpenBSD. This allows to group interfaces in
order to - for example - apply firewall rules to a whole group of
interfaces.  This is required for importing pf from OpenBSD 3.9

Obtained from:	OpenBSD (with changes)
Discussed on:	-net (back in April)
2006-06-19 22:20:45 +00:00
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