Draft: Add support for nftables in nwfilter driver

Daniel P. Berrangérequested to merge
berrange/libvirt-tck:nftables-nwfilter into master

This add support for nftables with the nwfilter driver.

It is based on the v5 posting, so will need some small tweaks for v6

https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/7SHFREFZCRAUN3GUCD75S4APZHWCEQIU/

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