xtables: initialize basechains only once on ruleset restore

We cannot assume iptables-restore files always come with explicit
basechain definition, eg.

:PREROUTING ACCEPT

incremental ruleset updates may deliberately skip this.

But loading basechains over and over again can take time, so do it just
once per batch.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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