Fix GCE channels version constraints #11076
Merged
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Previously k8s 1.18+ would always match with COS rather than Ubuntu 20.04 because of the unbound version range.
This should fix the failure to download logs via SSH here: https://prow.k8s.io/view/gs/kubernetes-jenkins/logs/e2e-kops-gce-kubetest2/1373013584195358720
The instance groups confirm the use of COS rather than u2004: https://storage.googleapis.com/kubernetes-jenkins/logs/e2e-kops-gce-kubetest2/1373013584195358720/artifacts/instancegroups.yaml
we may need to cherrypick the test updates to release-1.20