Kubevirtci updates

[davidvossel]

This updates the kubevirtci script to include the following changes

• adds ssh commands for accessing tenant and infra nodes
• adds a destroy-cluster command
• separates create-cluster into two commands, create-cluster and create-external-cluster. The new create-external-cluster command simulates an external cluster using the clusterkubevirtadm command. The normal create-cluster commands treats the infra and management as the same cluster.
• adds the namespace to the create-cluster command so clusters are created in the $TENANT_CLUSTER_NAMESPACE instead of the default namespace.
• fixes the new kubectl-tenant command to look in the $TENANT_CLUSTER_NAMESPACE when finding the guest cluster's kubeconfig

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidvossel

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• OWNERS [davidvossel]

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[davidvossel]

/cc @nirarg

maybe you can take a look at this?

[davidvossel]

/ok-to-test

[coveralls]

Pull Request Test Coverage Report for Build 2387060883

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 45.93%

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Totals
Change from base Build 2380315759:	0.0%
Covered Lines:	711
Relevant Lines:	1548

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💛 - Coveralls

[nirarg]

/lgtm