Description: netfilter: add and use nf_hook_slow_list()
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=1914719
 https://bugzilla.kernel.org/show_bug.cgi?id=209823
Notes:
 carnil> Issue introduced seem introduced specifically in the 5.4.y with
 carnil> d18d22ce8f62 in 5.4.16. It was as such present in usntable with
 carnil> the 5.4.19-1 release and later fixed once moved to the 5.5.y
 carnil> series.
 carnil> introduced likely earlier but only uncovered later and the fix
 carnil> for older stable series is
 carnil> https://lore.kernel.org/stable/20201121034317.577081-1-xiyou.wangcong@gmail.com/
Bugs:
upstream: released (5.5-rc1) [ca58fbe06c54795f00db79e447f94c2028d30124]
5.10-upstream-stable: N/A "Fixed before branching point"
4.19-upstream-stable: released (4.19.161) [5460d62d661c0fc53bfe83493821b1dc3dc969f4]
4.9-upstream-stable:  N/A "Vulnerable code not present"
sid: released (5.5.13-1)
4.19-buster-security: released (4.19.171-1)
4.9-stretch-security: N/A "Vulnerable code not present"