Remap all init container images of etcd-manager

[alasdairtran]

I was testing out kops v1.27.0-beta.1 and noticed that the new kops-utils-cp init container image for etcd-manager hasn't been remapped via the asset builder and thus not copied to our custom container proxy when we run kops get assets --copy.

This PR adds the missing code to remap the kops-utils-cp image.

[k8s-ci-robot]

Hi @alasdairtran. Thanks for your PR.

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[rifelpet]

/ok-to-test

[hakman]

Thanks @alasdairtran. Nice find and fix!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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