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/efk/elasticsearch/templates/efk-clusterrolebinding.yml

@@ -3,11 +3,11 @@ kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1beta1
 metadata:
   name: efk
-  namespace: {{ system_namespace }}
+  namespace: kube-system
 subjects:
   - kind: ServiceAccount
     name: efk
-    namespace: {{ system_namespace }}
+    namespace: kube-system
 roleRef:
   kind: ClusterRole
   name: cluster-admin