[2.17] Fixed default DNS min replica for single node cluster

[smasset]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Single node cluster don't need 2 coreDNS pods.
This PR compares 2 (current absolute default value) and the length of the k8s_cluster inventory group and uses the minimum as the default value for dns_min_replicas

Which issue(s) this PR fixes:
N/A

Special notes for your reviewer:
N/A

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

Hi @smasset. 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.

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[smasset]

/sig cluster-lifecycle

[smasset]

/check-cla

[smasset]

/check-cla

[floryut]

/hold
Push to branch can only be used to backport changes done in master.

[smasset]

@floryut I was waiting for the builds to pass before opening the PR on master branch. Please check #8112

[floryut]

@floryut I was waiting for the builds to pass before opening the PR on master branch. Please check #8112

Indeed, as it's merge on master let's go for 2.17 🎉
Oops didn't see that it was lgtm cancelled

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[smasset]

@floryut I was waiting for the builds to pass before opening the PR on master branch. Please check #8112

Indeed, as it's merge on master let's go for 2.17 tada Oops didn't see that it was lgtm cancelled

Fixed both PRs and now using k8s_cluster group

[k8s-ci-robot]

@smasset-orange: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[oomichi]

Thanks for backporting.

/ok-to-test
/lgtm