Add doc on OpenStack provider

[zreigz]

This documentation is related to pull request: kubernetes/kubernetes#21737

[idvoretskyi]

@zreigz, please, note that OpenStack CLI clients like python-<PROJECTNAME>client are going to be deprecated soon in favor of universal openstack CLI client - https://specs.openstack.org/openstack/openstack-specs/specs/deprecate-cli.html.

I suppose, it will be useful to modify your existing documentation with these updates.

[zreigz]

Thanks for comment. I've already added this information

[idvoretskyi]

As we have discussed on Kubernetes/OpenStack-SIG Slack channel and bi-weekly meeting, the "default" OpenStack provider for kube-*.sh scripts has to be technology agnostic and be able to run on any OpenStack environment (no Heat, no Magnum, no Murano, only "basic" OpenStack components).

I'd like to suggest to put this document to the "Custom solutions" section and name as "OpenStack with Heat" or something similar.

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[elsonrodriguez]

Yeah, once the kube-up provider gets merged, we should ping someone to merge this.

Also, to bypass CLA-bot: I consent to have this commit merged in.

[idvoretskyi]

@elsonrodriguez @zreigz please, add to the prerequisites section information about the cluster minimal requirements to deploy the solution (cluster size requirements, necessary components to be enabled, i.e. Heat etc.)

[zreigz]

@idvoretskyi PTAL

[elsonrodriguez]

@quinton-hoole PTAL, now that the kube-up provider is merged, we need an M for people to RTF out of.

[ghost]

From kubectl.sh:

# echo "NOTE:"
# echo "kubectl.sh is deprecated and will be removed soon."
# echo "please replace all usage with calls to the kubectl"
# echo "binary and ensure that it is in your PATH." 
# echo ""
# echo "Please see 'kubectl help config' for more details"
# echo "about configuring kubectl for your cluster."
# echo "-=-=-=-=-=-=-=-=-=-="

[ghost]

also, please use clusterstatuses, rather than cs.

[elsonrodriguez]

Regarding the kubectl.sh, I've subscribed to this: kubernetes/kubernetes#8817

In terms of user experience, kubectl.sh provides the easiest way to start with k8s, especially from the get.k8s.io perspective (curl | bash).

Once kubectl.sh has been converted to an installer for kubectl, I'll update the docs accordingly.

[ghost]

As above.

[ghost]

@elsonrodriguez Minor nits. Happy to address those in a separate PR.
@johndmulhausen Needs your docs approval, I believe. I did not spot any egregious errors, but you might want to double-check.

[bgrant0607]

We can fix any problems in follow-ups.