Create namespace when dashboard deployment uses customized namespace. (#6107)

* Create namespace when dashboard deployment uses customized namespace.

* Fix syntax.

roles/kubernetes-apps/ansible/templates/dashboard.yml.j2

@@ -17,9 +17,18 @@
 #
 # Example usage: kubectl create -f <this_file>
 
+{% if dashboard_namespace != "kube-system" %}
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: {{ dashboard_namespace }}
+  labels:
+    name: {{ dashboard_namespace }}
+{% endif %}
+
 ---
 # ------------------- Dashboard Secrets ------------------- #
-
 apiVersion: v1
 kind: Secret
 metadata: