[delta-ipv6] Shared control plane vars

[afazekas]

There is two stage with control plane config,
the shared options moved to a shared file which
used by both stages.

[fultonj]

@afazekas is this being done to address a bug? What about this is specific to delta-IPv6?

[afazekas]

delta-ipv6 has ironic enabled and the 2th definition of the control-plane otherwise undo the ironic config.

[fultonj]

+2 from me

@hjensas are you ok with this?

[hjensas]

+2 from me

@hjensas are you ok with this?

+2 from me as well, without this we ended up enabling ironic when initially deploying the controlplane, then disabling it post ceph deployment when the controlplane was re-configured.

[fultonj]

/approve
/lgtm

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[fultonj]

please consider cherry picking as per https://github.com/openstack-k8s-operators/architecture/blob/main/docs/contributing/cherry-picking.md

[softwarefactory-project-zuul]

Build succeeded (gate pipeline).
https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/4f7f6f1789844998b289591a805b50e6

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✔️ rhoso-architecture-validate-uni04delta-ipv6 SUCCESS in 5m 09s