[3.5] config: support AllowedCN and AllowedHostname through config file

[ArkaSaha30]

Backport of #17861, resolves #17867.
Blocks v3.5.14 release: #18013
This backport allows setting AllowedCN and AllowedHostname tls fields through config file for peer transport security.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Hi @ArkaSaha30. Thanks for your PR.

I'm waiting for a etcd-io 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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[ArkaSaha30]

cc @jmhbnz @ahrtr

[jmhbnz]

/ok-to-test

[jmhbnz]

Backport looks good to me, many thanks for helping work towards 3.5.14 release @ArkaSaha30

[ahrtr]

LGTM

Thanks @ArkaSaha30

[ivanvc]

Thanks @ArkaSaha30. I think we're just missing the release note. Can you open a PR to update the CHANGELOG?

[ArkaSaha30]

Thanks @ArkaSaha30. I think we're just missing the release note. Can you open a PR to update the CHANGELOG?

Sure, I'll raise a PR to update the CHANGELOG 👍