update the readme for new versions of OpenStack

[lachlansimpson]

Potentially even link to the openstack wiki page release notes

In particular, probably retire the reference to Juno.

[MartinPaulo]

The references to versions of OpenStack in the readme are to show the earliest versions of OpenStack that the templates in the repository will work with. I'll put on my thinking cap and see if I can come up with a clearer way of expressing this...

[lachlansimpson]

Think about it like this: I know Nectar. I've heard that it's an instance of OpenStack. That's it. That's absolutely it.

The OpenStack docs are so comprehensively huge that it's impossible to find simple information quickly or easily.

So this leads to two frustrating situations: I don't know what Juno or Kino are. I don't know what "later than X" means - is that 1997 or 2007 or 2017?

Also, I only know that we are currently at Newton (or almost) because Linh told me in the slack channel.

This also leads to the problem that the python tools don't work - you need to get older python tools (eg heat for instance). But there's no way to know that Nectar is only at Newton, and that it will require specific versions of the python tools.

[sorrison]

I can't answer all of these questions but we do have this https://trello.com/b/9fkuT1eU/nectar-openstack-versions. We should publish this more widely.

We're working on updating this repo, in the mean time if you have other issues we're more than happy to help via our helpdesk [email protected]