Merge branch 'netlink-protocol-specs'

Jakub Kicinski says:

====================
Netlink protocol specs

I think the Netlink proto specs are far along enough to merge.
Filling in all attribute types and quirks will be an ongoing
effort but we have enough to cover FOU so it's somewhat complete.

I fully intend to continue polishing the code but at the same
time I'd like to start helping others base their work on the
specs (e.g. DPLL) and need to start working on some new families
myself.

That's the progress / motivation for merging. The RFC [1] has more
of a high level blurb, plus I created a lot of documentation, I'm
not going to repeat it here. There was also the talk at LPC [2].

[1] https://lore.kernel.org/all/20220811022304.583300-1-kuba@kernel.org/
[2] https://youtu.be/9QkXIQXkaQk?t=2562
v2: https://lore.kernel.org/all/20220930023418.1346263-1-kuba@kernel.org/
v3: https://lore.kernel.org/all/20230119003613.111778-1-kuba@kernel.org/1

v4:
 - spec improvements (patch 2)
 - Python cleanup (patch 3)
 - rename auto-gen files and use the right comment style
====================

Link: https://lore.kernel.org/r/20230120175041.342573-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>