xtables: Match verbose ip{,6}tables output with legacy

xtables: Match verbose ip{,6}tables output with legacy

Legacy ip{,6}tables prints feedback for various commands if in verbose
mode, make sure nft variants do the same.

There is one difference, namely when checking a rule (-C command):
Legacy ip{,6}tables print the rule in any case, nft variants don't in
case the rule wasn't found. Changing this though would require to
populate the nftnl_rule object just for printing, which is probably not
feasible.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>