Address standalone kubelet config case

Also place in global vars and do not repeat the kube_*_config_dir
and kube_namespace vars for better code maintainability and UX.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/dnsmasq/templates/dnsmasq-ds.yml

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