[PATCH] Remove addresses from old tun device when stealing leases

[Brian Chu]

Hi Nikos,

On FreeBSD (and probably OpenBSD), when a user resumes a session using
cookie (e.g. when quickly switching between Wi-Fi and 3G on a mobile
device), we must first remove addresses from the old tun device before
assigning them to the new tun device, otherwise the assignment may
fail with something like "main: tun.c:197: tun1: Error setting IPv6:
Address already in use". I have attached a patch to fix this issue.
This problem was reported to me by hshh <hunreal at gmail.com>.

I'm not sure if the same behaviour is required on Linux -- probably
not, since nobody has reported this problem so far.

Cheers,
Brian
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