ansible-role-firewall
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Ensure iptables is really installed.
We had a PR (#21) that made sure iptables was installed.
Is it really the case on supported OSes (centos-6, centos-7, ubuntu-xenial, ubuntu-trusty), that maybe iptables is not installed?
Maybe adding couldn't hurt.
It needs for minimal (ubuntu minimal) version only. If iptables were installed ansible will skip this stage.
CentOS 7 comes preinstalled with "firewalld". So it is necesarry to trigger installation.
It would be necessary as well to stop/disable firewalld which is not jet done. (will create a seperat ticket for it)