Bridge config in /etc/rc (patch)

[M. Warner Losh]

I think I like this syntax and have only one comment.  This seems to
match up with ifconfig's aliases fairly well.  However, I think that
the model here might be better served by the routes:

bridge_names="a b c"
bridge_a="fxp1 rl0"
bridge_b="dc1 fxp0"
bridge_c="rl1 dc0"

I'd stick to spaces only, to match the sysctl.  I don't think that it
goes too far.  This doesn't really change the number of knobs that a
normal user has to deal with, but does allow some of the more advanced
functions to be more easily accessed.

Warner