Add comment indicating server-snippet section

[tacospiller]

This PR adds a comment line in the generated nginx config file just before the server-snippet section configured by an ingress object.

What this PR does / why we need it:

An invalid server snippet may cause verification failure of the entire nginx configuration. The comment line could help the investigation when such incident occurs.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @tacospiller. Thanks for your PR.

I'm waiting for a kubernetes 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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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[aledbf]

/ok-to-test

[aledbf]

/lgtm
/approve

[aledbf]

@tacospiller thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, tacospiller

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Needs approval from an approver in each of these files:

• OWNERS [aledbf]

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