RFE Customizable Kubevirtci

[oshoval]

Is your feature request related to a problem? Please describe:
Sometimes in order to develop / debug, we just need to change some manifest
i.e kubeadm.conf, calico manifests etc
Provision takes lots of time.

Describe the solution you'd like:
We can create a folder in the host with manifests, and those manifests if exist,
would be populated into the cluster, replacing the manifests it use.

Describe alternatives you've considered:
We can update the container instead, but it would be the best to have a robust
method.

Additional context:
Add any other context or screenshots about the feature request here.

[oshoval]

/cc @brianmcarey

[kubevirt-bot]

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[kubevirt-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
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