Try to fix prow CI test failures with iptables change

[mboersma]

What type of PR is this?

/kind failing-test

What this PR does / why we need it:

Tries to work around networking issues that cropped up recently in CI, based on success with this approach by the secrets-store-csi-driver project.

Which issue(s) this PR fixes:

Refs kubernetes/test-infra#23741
See kubernetes/test-infra#23744

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[mboersma]

/status in-progress

[k8s-ci-robot]

You must be a member of the kubernetes-sigs/cluster-api-provider-azure-maintainers GitHub team to add status labels. If you believe you should be able to issue the /status command, please contact your Cluster API Provider Azure Maintainers and have them propose you as an additional delegate for this responsibility.

[mboersma]

/hold

[CecileRobertMichon]

/close

fixing in kubernetes/test-infra#23744

[k8s-ci-robot]

@CecileRobertMichon: Closed this PR.

In response to this:

/close

fixing in kubernetes/test-infra#23744

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