Include nftables and appropriate modules. Translate ip- and ebtables
rules to their nftables counterparts. Remove ip/ebtables and modules.
This change intentionally tries to keep structural changes at a minimum
to keep the rule translation comprehensible.
kmod-nft-bridge is not required for fff-node, because it was merged into
a single kernel module since Linux 4.17:
[1] 02c7b25e5f
[2] fbaf48387e
Signed-off-by: Fabian Bläse <fabian@blaese.de>
Co-authored-by: Johannes Kimmel <fff@bareminimum.eu>
