Make "delete a KubeVirt CR" test Serial
Make "delete a KubeVirt CR" test Serial

Deleting Kubevirt object is usually only allowed
when no VMI and other Kubevirt objects exist

Signed-off-by: L. Pivarc <20641f57cb8ae0a0c0cb8324c56aa3e53fb301f0@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt