Add ip6tables to rootfs and make available in system containers

[tisoft]

It would be great to have ip6tables available at the same places where iptables is available currently.
Currently that seem to be the console and network containers.

The neccessary kernel modules are already there:

find /lib/modules/ -name ip6table*
/lib/modules/4.9.78-rancher2/kernel/net/ipv6/netfilter/ip6table_nat.ko
/lib/modules/4.9.78-rancher2/kernel/net/ipv6/netfilter/ip6table_mangle.ko
/lib/modules/4.9.78-rancher2/kernel/net/ipv6/netfilter/ip6table_raw.ko
/lib/modules/4.9.78-rancher2/kernel/net/ipv6/netfilter/ip6table_filter.ko

RancherOS Version: (ros os version)
1.2.0

Where are you running RancherOS? (docker-machine, AWS, GCE, baremetal, etc.)
baremetal

[niusmallnan]

We have not fully supported IPV6 yet, but add the ip6tables command should be easy.

[eexit]

The ip6tables command is available in runcmd but not in rancher.network.post_cmds.
It would be nice to have them available in both env.

[kingsd041]

Close it.
If you still have doubts, please reopen it and let me know.