[Commotion-admin] [commotion-router] Rate limit ssh attempts to WAN zone (#120)

[areynold]

@jheretic I've reverted the uci commit and fixed the syntax in /etc/firewall.user.

On the 4th ssh connection within 60 seconds, the connection attempt will hang until the minute is up. Existing ssh connections are not affected.

I have a newly built node up with these rules in place if you want to test them.

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https://github.com/opentechinstitute/commotion-router/pull/120#issuecomment-43659180
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