allow /31s on broadcast interfaces (eg ethernet) to work as per rfc3021.

the issue in our kernel was the broadcast address calculated on the /31
caused a ton of checks for use of broadcast addresses to kick in and
prevent one of the two addresses on the /31 from being used.

this diff basically detects if a /31 has been configured and doesnt
configure a broadcast address for it, which makes the ips usable
for normal traffic.

i wrote this so i could interoperate with "carrier" network gear
better, and sthen wants it so he can conserve address space use.

the further special casing of broadcast address handling was from claudio@

ok claudio@ markus@ sthen@ henning@

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