wireguard: add netlink mcast on endpoint change

Linus Karl linus at lotz.li
Sun Apr 10 19:06:34 UTC 2022

This patch adds the possibility to retrieve notifications of peer
endpoint changes via netlink multicast messages. It has been a while
since I posted v2, the main difference is that I've added an extra
attribute to the netlink device attributes to allow enabling or
disabling of this feature. It is per default disabled.

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