Can't replace a generic resource that is cluster scoped

It should be allowed to invoke kubectl replace with a JSON file that has
no resource version set.  Namespaced resources were working correctly,
but cluster resources were silently failing to lookup the current state
of the object to get the resource version because we weren't using
NamespaceIfScoped(). Added a failing test.

hack/test-cmd.sh

@@ -493,6 +493,31 @@ runTests() {
   kube::test::get_object_assert 'pod valid-pod' "{{(index .spec.containers 0).name}}" 'replaced-k8s-serve-hostname'
   #cleaning
   rm /tmp/tmp-valid-pod.json
+  
+  ## replace of a cluster scoped resource can succeed
+  # Pre-condition: a node exists
+  kubectl create -f - "${kube_flags[@]}" << __EOF__
+{
+  "kind": "Node",
+  "apiVersion": "v1",
+  "metadata": {
+    "name": "node-${version}-test"
+  }
+}
+__EOF__
+  kubectl replace -f - "${kube_flags[@]}" << __EOF__
+{
+  "kind": "Node",
+  "apiVersion": "v1",
+  "metadata": {
+    "name": "node-${version}-test",
+    "annotations": {"a":"b"}
+  }
+}
+__EOF__
+  # Post-condition: the node command succeeds
+  kube::test::get_object_assert "node node-${version}-test" "{{.metadata.annotations.a}}" 'b'
+  kubectl delete node node-${version}-test
 
   ## kubectl edit can update the image field of a POD. tmp-editor.sh is a fake editor
   echo -e '#!/bin/bash\nsed -i "s/nginx/gcr.io\/google_containers\/serve_hostname/g" $1' > /tmp/tmp-editor.sh