ipv6: allow nonlocal_bind for ipv6 addresses

[Timh B]

Hi,

We've encountered a problem when migrating services that uses vrrpd (for
example) to IPv6 (dualstack), a nonlocal_bind problem to be exact, for
IPv4 there's a sysctl-setting that allows us to bind to addresses that are
not configured on the host directly.

I'm aware that there's freebind and ip_transparent options to setsockopt()
but changing all the services's code would have been a larger task than
implementing the nonlocal_bind option for IPv6 in the kenrel.

The patch is done for kernel 3.5, so for 3.2 (Ubuntu 12.04 LTS) the patch
from Maciej Żenczykowski has to be applied first;

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/net/ipv6/af_inet6.c?id=f74024d9f05caa570dcf7582b498bbf011943491

My patch is attached.

Usage: sysctl -w net.ipv6.ip6_nonlocal_bind=1

-- Timh
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