iptables: accept multiple IP address specifications for -s, -d

libiptc already supports adding and deleting multiple rules with
different addresses, so it only needs to be wired up to the options.

	# ip6tables -I INPUT -s 2001:db8::d,2001:db8::e -j DROP

References: http://marc.info/?l=netfilter-devel&m=123929790719202&w=2

Adjustments made: syntax, removal of unneeded variables, manpage
adjustment, soversion bump.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
7 files changed