Don't check address space when using 'none' network plugin

Since 'none' can be, for instance, a manual calico deployment, don't
check whether there is enough ip for pods on a node, because the plugin
can use another mechanism than the podCIDR to allocate IPs.

roles/kubernetes/preinstall/tasks/0040-verify-settings.yml

@@ -112,8 +112,7 @@
   when:
     - not ignore_assert_errors
     - ('k8s_cluster' in group_names)
-    - kube_network_node_prefix is defined
-    - kube_network_plugin != 'calico'
+    - kube_network_plugin not in ['calico', 'none']
 
 - name: Stop if ip var does not match local ips
   assert: