sodalite.nodes.DockerHost installs wrong docker version on centos

[mihaTrajbaric]

This line was supposed to ensure centos7 gets docker version 19x.

I don't know why, but several centos7 deployments got docker 20x:

[centos@iac-blueprint-builder ~]$ docker --version
Docker version 20.10.5, build 55c4c88

[centos@pds ~]$ docker --version
Docker version 20.10.5, build 55c4c88

[centos@image-builder ~]$ docker --version
Docker version 20.10.5, build 55c4c88

The issue with this version was that it configured iptables in a way that did not allow wget calls from inside container.

Since pinning older docker version doesn't work anyway, maybe we should implement configuration of iptables?

Resources:
https://medium.com/@yudapramad/cannot-access-internet-inside-docker-container-a62fa3ed7860
https://docs.ansible.com/ansible/latest/collections/ansible/builtin/iptables_module.html