Rework default variant selection

[travier]

Goes with coreos/coreos-assembler#2934

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[openshift-ci]

@travier: 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/rhcos-86-build-test-metal	3e7e5b8	link	true	/test rhcos-86-build-test-metal
ci/prow/rhcos-86-build-test-qemu	3e7e5b8	link	true	/test rhcos-86-build-test-qemu

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[openshift-ci]

@travier: PR needs rebase.

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[travier]

Replaced by #901