bootkube: Use --image-references for MCO bootstrap

[cgwalters]

Depends: openshift/machine-config-operator#3017

I want to add a new image (e.g. rhel-coreos as part of layering)
and this will avoid a tedious "ratching" process to plumb that
through the installer. Now the MCO can just directly read the image
references.

[openshift-ci]

Skipping CI for Draft Pull Request.
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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[cgwalters]

(Draft since this is not tested yet, also this is a good time to object or propose a different plan)

[staebler]

This seems like a reasonable approach to me. I like the idea of pushing the domain knowledge of which images MCO is using to the MCO repo, instead of having it in the installer repo.

[jstuever]

/cc @patrickdillon
/uncc

[openshift-ci]

@cgwalters: The following tests 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/e2e-aws-upgrade	7991895	link	true	/test e2e-aws-upgrade
ci/prow/e2e-gcp-upgrade	7991895	link	true	/test e2e-gcp-upgrade
ci/prow/e2e-metal-ipi-ovn-ipv6	7991895	link	true	/test e2e-metal-ipi-ovn-ipv6
ci/prow/openstack-manifests	7991895	link	true	/test openstack-manifests
ci/prow/e2e-aws-upi	7991895	link	true	/test e2e-aws-upi
ci/prow/e2e-azure-upi	7991895	link	true	/test e2e-azure-upi
ci/prow/e2e-gcp-upi	7991895	link	true	/test e2e-gcp-upi
ci/prow/e2e-vsphere	7991895	link	true	/test e2e-vsphere
ci/prow/e2e-azure	7991895	link	true	/test e2e-azure
ci/prow/e2e-gcp	7991895	link	true	/test e2e-gcp
ci/prow/e2e-aws	7991895	link	true	/test e2e-aws
ci/prow/e2e-vsphere-ovn	7991895	link	true	/test e2e-vsphere-ovn
ci/prow/e2e-azure-ovn	7991895	link	true	/test e2e-azure-ovn
ci/prow/e2e-aws-ovn	7991895	link	true	/test e2e-aws-ovn
ci/prow/e2e-gcp-ovn	7991895	link	true	/test e2e-gcp-ovn
ci/prow/okd-scos-unit	7991895	link	true	/test okd-scos-unit
ci/prow/okd-scos-images	7991895	link	true	/test okd-scos-images
ci/prow/okd-scos-verify-codegen	7991895	link	true	/test okd-scos-verify-codegen
ci/prow/e2e-agent-compact-ipv4	7991895	link	true	/test e2e-agent-compact-ipv4

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[patrickdillon]

/close

in favor of #6234

[openshift-ci]

@patrickdillon: Closed this PR.

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In response to this:

/close

in favor of #6234

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