docs: kubernetes_distros: complete note about socat on Container Linux
docs: kubernetes_distros: complete note about socat on Container Linux

This fixes two things:

1) CoreOS Linux is now Container Linux https://coreos.com/blog/tectonic-self-driving.html#coreos-linux-is-now-container-linux

2) Provide more technical details on what is going on for users trying
to debug and understand

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