add coredns_additional_configs to handle any extra configurations for…

[navidnabavi]

What type of PR is this?

/kind feature

What this PR does / why we need it:
It adds the coredns_additional_configuration inventory variable to append defined configurations. It is useful when we need to add some configurations to the Corefile itself mostly when using external plugins of CoreDNS.
Which issue(s) this PR fixes:

Fixes #10023

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Only if you use the new variable.

Add `coredns_additional_configuration` variable to define extra Coredns configurations

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: navidnabavi / name: Navid Nabavi (8c27e90)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @navidnabavi. Thanks for your PR.

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[yankay]

/ok-to-test

[navidnabavi]

CI is not running properly!

[floryut]

@navidnabavi Thank you for the PR 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, navidnabavi

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[mzaian]

Thanks @navidnabavi
/lgtm