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/network_plugin/canal/templates/canal-cr-calico.yml.j2

@@ -3,7 +3,7 @@ kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1beta1
 metadata:
   name: calico
-  namespace: {{ system_namespace }}
+  namespace: kube-system
 rules:
   - apiGroups: [""]
     resources:

roles/network_plugin/canal/templates/canal-crb-calico.yml.j2

@@ -11,4 +11,4 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: canal
-  namespace: {{ system_namespace }}
+  namespace: kube-system

roles/network_plugin/canal/templates/canal-crb-flannel.yml.j2

@@ -11,4 +11,4 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: canal
-  namespace: {{ system_namespace }}
+  namespace: kube-system

roles/network_plugin/canal/templates/canal-node-sa.yml.j2

@@ -3,7 +3,7 @@ apiVersion: v1
 kind: ServiceAccount
 metadata:
   name: canal
-  namespace: {{ system_namespace }}
+  namespace: kube-system
   labels:
     kubernetes.io/cluster-service: "true"
 

roles/network_plugin/canal/templates/canal-node.yaml.j2

@@ -3,7 +3,7 @@ kind: DaemonSet
 apiVersion: extensions/v1beta1
 metadata:
   name: canal-node
-  namespace: {{ system_namespace }}
+  namespace: kube-system
   labels:
     k8s-app: canal-node
 spec: