Ensure operator-upgrade tests use correct container disk
Ensure operator-upgrade tests use correct container disk

ContainerDisks are not yet officially in v1 and were as such not
backward compatible. Ensure that a containerDisk from the previous
release is used. This requirement will go away once this PR is merged.

davidvossel/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt