Fix conformance coredns deployment

[asmigala]

/kind bug

What this PR does / why we need it:

This PR fixes conformance test when running on OpenShift. The coredns deployment required by some tests would fail to start due to missing NET_BIND_SERVICE capability

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NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: asmigala
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @asmigala. Thanks for your PR.

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[youngnick]

/ok-to-test