Alan Orth 96f62a17d1 roles/common: Use nftables backend in firewalld on Ubuntu 20.04
The nftables backend should be more performant and flexible. I had
been planning to use it on Ubuntu 18.04 and Debian 10 as well, but
there were issues with the specific versions used in those distros.

See: https://firewalld.org/2018/07/nftables-backend
2020-06-08 12:15:29 +03:00
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