add cilium in error message

[PascalBourdier]

add cilium in error message like other networks

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[k8s-ci-robot]

Hi @PascalBourdier. 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.

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[PascalBourdier]

/ok-to-test

[k8s-ci-robot]

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

In response to this:

/ok-to-test

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[chrisz100]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrisz100, PascalBourdier

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