[th/marvell-boot-live-iso-dpu] marvell: boot live ISO for accessing worker node

[thom311]

We use pxeboot to install RHEL on the DPU. For that, we need to SSH into
the host (that has the DPU inside) and run a podman command. That
requires that the host is up and accessible via SSH.

If the host is not accessible, then fallback to boot a CoreOS Live iso.

https://issues.redhat.com/browse/MDC-108
https://issues.redhat.com/browse/IIC-806

[openshift-ci]

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[thom311]

/hold

[thom311]

waiting on bn222/cluster-deployment-automation#383

[thom311]

/retest

[openshift-ci]

@thom311: The following tests 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/make-vendor-check	c2cc5fb	link	true	/test make-vendor-check
ci/prow/make-e2e-test-marvell	c2cc5fb	link	true	/test make-e2e-test-marvell
ci/prow/images	c2cc5fb	link	true	/test images
ci/prow/make-e2e-test	c2cc5fb	link	true	/test make-e2e-test
ci/prow/verify-deps	c2cc5fb	link	true	/test verify-deps

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[thom311]

/retest