[openstack-helm] Initial spec for multiple container distribution support

Hi,

One of the items that came up in the meeting this week was to get a spec together for supporting multiple distributions in containers managed via OpenStack-Helm.

Currently, we ubiquitously use Ubuntu-based images, but would also like to support both CentOS and OpenSUSE in addition.

As there's a lot to discuss here, I've created the following etherpad to allow us to work through these issues prior to the next meeting - at which point we should hopefully be at the point where we can start writing a formal spec.

* https://etherpad.openstack.org/p/openstack-helm-container-distro-support

Cheers

Pete