change dns upstream condition for coredns

[waruwat-dev]

upstream_dns_servers should change corefile config even resolvconf_mode=docker_dns

What type of PR is this?
/kind bug

What this PR does / why we need it:
upstream dns should be used even if it is resolvconf_mode: docker_dns

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Change dns upstream condition for coredns (use upstream dns even whern `resolveconf_mode` is set to `docker_dns`)

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ toplordsaito (c25f460)

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[cristicalin]

Hi @toplordsaito, thanks for your contribution.

I think we need to merge #8247 first before accepting this change to ensure adequate coverage.

Also please ensure to sign the CLA for the change to be accepted (https://api.easycla.lfx.linuxfoundation.org/v2/repository-provider/github/sign/20677499/43613404/8263/#/?version=2).

[cristicalin]

/check-cla

/ok-to-test

[cristicalin]

/lgtm

[floryut]

@toplordsaito 👍
Thanks for the PR

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[APPROVALNOTIFIER] This PR is APPROVED

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

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