data/data/openstack: Add registry to coredns image

[tomassedovic]

The OpenStack deployment started failing with the following message:

Error: error pulling image "openshift/origin-coredns:v4.0": unable to pull openshift/origin-coredns:v4.0: image name provided is a short name and no search registries are defined in the registries config file.

That caused the local-dns service on the Service VM to fail which
resulted in none of the nodes receiving Ignition and booting up.

Specifying the quay.io registry explicitly fixes this issue.

[tomassedovic]

/label platform/openstack

/assign @trown

Not sure why I started seeing it now and I'm also not sure whether other deployments (like the CI) are affected. But it's a quick and easy fix.

All of this will go away once #1959 merges, but we probably want this fix in the meantime.

[Fedosin]

/lgtm

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@tomassedovic: The following test failed, say /retest to rerun them all:

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ci/prow/e2e-aws-scaleup-rhel7	6bfd6db	link	/test e2e-aws-scaleup-rhel7

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