update-rhcos-bootimage: check that RHCOS metadata has necessary artif…

[miabbott]

…acts

It is possible to feed the update-rhcos-bootimage.py script a
meta.json input that does not contain all the boot image artifacts
required when doing a boot image bump. This changes the script to bail
out if the length of the images dict is less than or equal to 2,
which indicates that only the ostree tarball and qemu qcow2 image
were produced as part of an RHCOS build.

[openshift-ci]

@miabbott: 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-workers-rhel7	b71781f	link	false	/test e2e-aws-workers-rhel7
ci/prow/e2e-aws-workers-rhel8	b71781f	link	false	/test e2e-aws-workers-rhel8
ci/prow/e2e-libvirt	b71781f	link	false	/test e2e-libvirt
ci/prow/e2e-metal-ipi-ovn-ipv6	b71781f	link	false	/test e2e-metal-ipi-ovn-ipv6
ci/prow/e2e-crc	b71781f	link	false	/test e2e-crc

Full PR test history. Your PR dashboard.

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[miabbott]

This change doesn't affect any of the CI jobs, so I think any failures can be safely ignored in the context of this change.

[cgwalters]

Note #5252 obsoletes this.
(But, this PR is obviously safer to backport, so we could in theory merge this first and then rebase 5252 on it. Or we could merge 5252 and just open backport PRs with this change)

[staebler]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, staebler

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[openshift-ci]

@miabbott: PR needs rebase.

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[miabbott]

With #5252 being merged, this change is no longer necessary. A similar check should be added to the plume cosa2stream function