accelerate forwarding by using nftables flowtables.

[majst01]

Especially for the storage network connection this should speed up things quite noticeable

Nice writeups:

• https://thermalcircle.de/doku.php?id=blog:linux:flowtables_1_a_netfilter_nftables_fastpath
• https://firewalld.org/2023/05/nftables-flowtable
• nftables wiki https://wiki.nftables.org/wiki-nftables/index.php/Flowtables
• https://www.kernel.org/doc/html/latest/networking/nf_flowtable.html

[majst01]

This is better suited in metal-networker