HOSTEDCP-996: CLI: enable guest cluster dump for private clusters

[csrwng]

What this PR does / why we need it:
Uses port-forwarding to access a kube-apiserver pod in the control plane directly. This avoids the need to have access to the external API endpoint of the guest cluster.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #HOSTEDCP-996

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.

[openshift-ci-robot]

@csrwng: This pull request references HOSTEDCP-996 which is a valid jira issue.

In response to this:

What this PR does / why we need it:
Uses port-forwarding to access a kube-apiserver pod in the control plane directly. This avoids the need to have access to the external API endpoint of the guest cluster.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #HOSTEDCP-996

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-ci-robot]

@csrwng: This pull request references HOSTEDCP-996 which is a valid jira issue.

In response to this:

What this PR does / why we need it:
Uses port-forwarding to access a kube-apiserver pod in the control plane directly. This avoids the need to have access to the external API endpoint of the guest cluster.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #HOSTEDCP-996

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

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[bryan-cox]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bryan-cox, csrwng

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[openshift-ci]

@csrwng: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-kubevirt-aws-ovn	10e530b	link	false	/test e2e-kubevirt-aws-ovn

Full PR test history. Your PR dashboard.

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