netfilter: add -n to iptables and ip6tables calls
netfilter: add -n to iptables and ip6tables calls

To preload netfilter modules, criu runs "iptables -L" and "ip6tables -L"
before starting to dump or restore a process tree.

On systems with many entries, the above commands without the -n option
take a long time because of lengthy DNS lookups.

Signed-off-by: Saied Kazemi <4b05cea9641ab3f4544bc7c6e600aab00faa2e7f@google.com>
Acked-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

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