Adds `nodelocaldns_additional_configs` to facilitate additional CoreDNS config options

[0x4c6565]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Adds an extra variable nodelocaldns_additional_configs to allow additional config to be added to the node-local DNS CoreDNS config, just as can be done with normal CoreDNS config with variable coredns_additional_configs

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

Could we simply reuse the existing variable coredns_additional_configs here instead of adding a new variable?

Does this PR introduce a user-facing change?:

Adds `nodelocaldns_additional_configs` variable

[k8s-ci-robot]

Hi @0x4c6565. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

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

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[yankay]

/ok-to-test

[yankay]

Thanks @0x4c6565 /approve

@cyclinder would you please help to review it .

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 0x4c6565, yankay

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/kubespray/blob/master/OWNERS)~~ [yankay] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[cyclinder]

/lgtm

/cc @yankay Could you please approval this?