Should we be reverting iptables to iptables-legacy for eoan?

[Julian Andres Klode]

Hi folks,

it turns out that lxd is broken by iptables now using the nft
based stuff, because lxd is still using the legacy one from
inside the snap.

This provides a terrible experience because networking in lxd
is not working at all once you enable ufw.

I'd suggest we increase the priority of iptables-legacy for eoan,
so that it is the default, and move the switch to xtables-nft-based
one to next release.

This will allow us to have working lxd networking, and gives
the lxd team some breathing room.

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