[connman] Ignore non-protocol IPv6 iptables rule -m switch. JB#44205
This sets to ignore all IPv6 rules with -m switch other than one of the supported protocols in firewall configs. The reason is that iptables matches as of now cannot be used for both IPv4 and IPv6. Reason for this is not clear. It may be that iptables is not built for it, or some implementation is missing from connman. In case of changing IP protocol in iptables.c when a same named match is already loaded in iptables, the content of the previous IP protocol is given with the function callbacks that understand only the previous IP protocol. IP protocol family is set correctly but everything else is not. This should be reverted if iptables 1.8.1 brings any changes. Or some new idea arises. This means that IPv6 INPUT policy can never be DROP.
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