Document OPNET use of port 53

[cybertron]

We've had a coredns instance running on the host using port 53 for quite a while now, but it was never formally documented. This fixes that oversight.

[cybertron]

/cc @mkowalski @emy

[mkowalski]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

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[mkowalski]

/lgtm

[cybertron]

/assign @TrilokGeer

[openshift-bot]

Inactive enhancement proposals go stale after 28d of inactivity.

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Mark the proposal as fresh by commenting /remove-lifecycle stale.
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/lifecycle stale

[openshift-bot]

Stale enhancement proposals rot after 7d of inactivity.

See https://github.com/openshift/enhancements#life-cycle for details.

Mark the proposal as fresh by commenting /remove-lifecycle rotten.
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/lifecycle rotten
/remove-lifecycle stale

[mkowalski]

/remove-lifecycle rotten

[cybertron]

@knobunc Could you approve this?