nft: don't resolve hostnames by default

This patch changes the default behaviour of nft to not translate IP
addresses to hostnames when printing rules if no options are passed.

The options regarding translations after this patch are:

 <no -n/-N>             show IP addresses numerically (default behaviour)
 -n                     show IP addresses numerically
 -nn                    show Internet services and uid/gid numerically
 -nnn                   show protocols numerically
 -N (--reversedns)      translate IP addresses to names

The idea is to avoid breaking existing scripts that most likely rely on
'-n' to save the ruleset, so we reduce the impact of this patch and
provide a default behaviour that doesn't generate network traffic when
listing / saving the ruleset.

Joint work with Pablo.

Suggested-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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