This go-nft version allows its users to only read particular
tables/chains when invoking `ReadConfig`, instead of the entire ruleset.
This will make deleting rules from a large ruleset faster, thus speeding
up CNI DELs.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2175041
Signed-off-by: Miguel Duarte Barroso <mdbarroso@redhat.com>