Add predictable IP support for Unbound

[abhiramnarayana]

Enable predictable IP allocation for Unbound pods, using the same mechanism as mDNS and BIND. Unbound IPs are allocated last in the chain (mDNS → BIND → Unbound) to avoid disrupting existing assignments on upgrades.

Adds NetUtilsImage field to DesignateUnboundSpecBase, a predictableips init container to the Unbound StatefulSet, and the designate-unbound-ip-map ConfigMap managed by the parent controller. Unbound does not need a designate.conf init container since it uses its own unbound.conf configuration.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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

Details

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

[openshift-ci]

Hi @abhiramnarayana. Thanks for your PR.

I'm waiting for a openstack-k8s-operators 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.

Tip

We noticed you've done this a few times! Consider joining the org to skip this step and gain /lgtm and other bot rights. We recommend asking approvers on your previous PRs to sponsor you.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

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-sigs/prow repository.

[omersch381]

/ok-to-test