add support for installing nonKIND cluster via kubeadm

[vjayaramrh]

allows for installing nonKIND K8S cluster on ubuntu and fedora for e2e test cases

[electrocucaracha]

There are several things to consider for this approach:

• Maintenance: There are plenty of mature options to deploy production-ready Kubernetes clusters. Kubespray has been used by several projects, but we can make a deep analysis on others.
• Cluster API support: Using non-KinD cluster will result in a different Infrastructure Cluster API provider.

[radoslawc]

/approve

[radoslawc]

I like that those are in vars file, gj

[nephio-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[vjayaramrh]

There are several things to consider for this approach:

* Maintenance: There are [plenty of mature options](https://www.cncf.io/certification/software-conformance/) to deploy production-ready Kubernetes clusters. [Kubespray](https://kubespray.io/#/) has been used by several projects, but we can make a deep analysis on others.

* Cluster API support: Using non-KinD cluster will result in a different [Infrastructure Cluster API provider](https://cluster-api.sigs.k8s.io/reference/providers.html).

@electrocucaracha Great points, This is now a first step and we should definitely iterate to get there.

[radoslawc]

/lgtm

[electrocucaracha]

/hold

This needs more discussion and input from others