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/fluentd/templates/fluentd-config.yml.j2

@@ -2,7 +2,7 @@ apiVersion: v1
 kind: ConfigMap
 metadata:
   name: fluentd-config
-  namespace: "{{ system_namespace }}"
+  namespace: "kube-system"
 data:
   {{ fluentd_config_file }}: |
     # This configuration file for Fluentd / td-agent is used

roles/kubernetes-apps/efk/fluentd/templates/fluentd-ds.yml.j2

@@ -4,7 +4,7 @@ apiVersion: extensions/v1beta1
 kind: DaemonSet
 metadata:
   name: "fluentd-es-v{{ fluentd_version }}"
-  namespace: "{{ system_namespace }}"
+  namespace: "kube-system"
   labels:
     k8s-app: fluentd-es
     kubernetes.io/cluster-service: "true"