iptables: fix version in iptables(8)

Signed-off-by: Jiri Popelka <jpopelka@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
iptables.8: update coreteam members from manpage

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