Add KubeVirt Cluster API provider to the CLI

[dkrasins]

Implement a cluster provider for KubeVirt using Cluster API in the CLI.

Requirements

• The CLI needs a cluster provider (i.e. "ocne cluster start --provider kubvirt")
• The management cluster must be able to host the KubeVirt-based clusters
• An alternate cluster must be able to host KubeVirt-based clusters
• A management cluster must be able to create KubeVirt-based clusters in multiple target clusters
• The provider should be able to install a default set of infrastructure for KubeVirt into the target cluster
  • KubeVirt
  • A Load Balancer solution like MetalLB
• There must be the ability to create and publish OCK images for Kubevirt (i.e. "ocne image create --type kubevirt" and "ocne image push ...")
  • push to container image registry
  • copy into persistent volume

Tasks

• [ ] #22
• [ ] #23
• [ ] #24
• [ ] #25
• [ ] #26