Backport to release 1.26 - fix: handle subnets with resource based naming more flexibly

[cl-rf]

This adds support for RHEL based distributions that typically use a FQDN.

What type of PR is this?

Uncomment only one, leave it on its own line:

/kind api-change /kind bug /kind cleanup /kind design /kind documentation /kind failing-test /kind feature /kind flake

What this PR does / why we need it: Backport to fix resource based naming instances

Which issue(s) this PR fixes:

Fixes #799

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Backport to release 1.26 for resource based named instances

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @cl-rf. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[cartermckinnon]

/ok-to-test /lgtm

Thanks @cl-rf !

[cartermckinnon]

@cl-rf FYI the k/k repo has a really handy script to do cherry-picks, for future ref :+1:

https://kops.sigs.k8s.io/contributing/proposing-a-cherry-pick/

[cartermckinnon]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cartermckinnon

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes/cloud-provider-aws/blob/release-1.26/OWNERS)~~ [cartermckinnon] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment