Stop templating kube-system namespace and creating it (#2545)

Kubernetes makes this namespace automatically, so there is
no need for kubespray to manage it.

roles/kubernetes-apps/network_plugin/calico/tasks/main.yml

@@ -2,7 +2,7 @@
 - name: Start Calico resources
   kube:
     name: "{{item.item.name}}"
-    namespace: "{{ system_namespace }}"
+    namespace: "kube-system"
     kubectl: "{{bin_dir}}/kubectl"
     resource: "{{item.item.type}}"
     filename: "{{kube_config_dir}}/{{item.item.file}}"