Add support for DCN adoption

[olliewalsh]

Add a DT for DCN with no (local) storage, used for DCN adoption testing.
Based on the existing DCN example and the HCI VA where adoption was already supported.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: olliewalsh
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[openshift-ci]

@olliewalsh: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/unit	34ee8ff	link	true	/test unit

Full PR test history. Your PR dashboard.

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