Fallback sushy-emulator to public net if no ctlplane

[hjensas]

If ctlplane network is not enabled/attached to the controller-0 node fallback the sushy.utility host record to the public net.

This allows me to configure controller with only public net:

cifmw_libvirt_manager_configuration:
  vms:
    controller:
      nets:
        - ocpbm

cifmw_networking_definition:
  instances:
    controller-0:
      networks: {}

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign cjeanner for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[github-actions]

Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/588608daee004310bfaf76a3513f1aa0

✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 7m 41s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 34s
❌ build-push-container-cifmw-client TIMED_OUT in 1h 30m 31s
✔️ cifmw-molecule-reproducer SUCCESS in 18m 27s