tree-wide: Support pending change to use stream metadata for CoreOS

[cgwalters]

This is part of adapting RHCOS to use the same stream metadata JSON format
that FCOS uses:

openshift/os#477

This change specifically will pair with a pending change in:
openshift/installer#4582
to embed CoreOS stream metadata in the installer git instead
of the undocumented ad-hoc JSON format that ships there now.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[cgwalters]

On the plus side, it will be way easier now to reuse some of the jobs and infrastructure for FCOS directly, and we can also share tooling around downloading images that e.g. actually validates checksums/signatures and stuff.

[openshift-ci]

@cgwalters: PR needs rebase.

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[mtnbikenc]

/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/rehearse/openshift/installer/master/e2e-aws-upi	ad1b2cc	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-metal	ad1b2cc	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-gcp-upi-xpn	ad1b2cc	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-openstack-upi	ad1b2cc	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-gcp-upi	ad1b2cc	link	/test pj-rehearse
ci/rehearse/openshift/cluster-image-registry-operator/release-4.5/e2e-vsphere	ad1b2cc	link	/test pj-rehearse
ci/rehearse/openshift/installer/master/e2e-azure-upi	ad1b2cc	link	/test pj-rehearse
ci/prow/pj-rehearse	ad1b2cc	link	/test pj-rehearse
ci/build-farm/arm01-dry	ad1b2cc	link	/test arm01-dry
ci/build-farm/hive-dry	ad1b2cc	link	/test hive-dry
ci/prow/openshift-image-mirror-mappings	ad1b2cc	link	/test openshift-image-mirror-mappings
ci/prow/clusterimageset-updater	ad1b2cc	link	/test clusterimageset-updater
ci/build-farm/build03-dry	ad1b2cc	link	true	/test build03-dry
ci/build-farm/build04-dry	ad1b2cc	link	true	/test build04-dry

Full PR test history. Your PR dashboard.

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[openshift-bot]

Issues in openshift/release go stale after 30d of inactivity.

Mark the issue as fresh by commenting /remove-lifecycle stale.
Stale issues rot after an additional 15d of inactivity and eventually close.
Exclude this issue from closing by commenting /lifecycle frozen.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[openshift-bot]

Stale issue in openshift/release rot after 15d of inactivity.

Mark the issue as fresh by commenting /remove-lifecycle rotten.
Rotten issues close after an additional 15d of inactivity.
Exclude this issue from closing by commenting /lifecycle frozen.

If this issue is safe to close now please do so with /close.

/lifecycle rotten
/remove-lifecycle stale

[openshift-bot]

Rotten issues in openshift/release close after 15d of inactivity.

Reopen the issue by commenting /reopen.
Mark the issue as fresh by commenting /remove-lifecycle rotten.
Exclude this issue from closing again by commenting /lifecycle frozen.

/close

[openshift-ci]

@openshift-bot: Closed this PR.

In response to this:

Rotten issues in openshift/release close after 15d of inactivity.

Reopen the issue by commenting /reopen.
Mark the issue as fresh by commenting /remove-lifecycle rotten.
Exclude this issue from closing again by commenting /lifecycle frozen.

/close

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