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/kubernetes/master/tasks/main.yml

@@ -36,28 +36,27 @@
   tags: kube-apiserver
 
 - meta: flush_handlers
-# Create kube-system namespace
-- name: copy 'kube-system' namespace manifest
-  copy: src=namespace.yml dest=/etc/kubernetes/kube-system-ns.yml
+
+- name: copy kube system namespace manifest
+  copy: src=namespace.yml dest={{kube_config_dir}}/{{system_namespace}}-ns.yml
   run_once: yes
   when: inventory_hostname == groups['kube-master'][0]
   tags: apps
 
-- name: Check if kube-system exists
-  command: "{{ bin_dir }}/kubectl get ns kube-system"
+- name: Check if kube system namespace exists
+  command: "{{ bin_dir }}/kubectl get ns {{system_namespace}}"
   register: 'kubesystem'
   changed_when: False
   failed_when: False
   run_once: yes
   tags: apps
 
-- name: Create 'kube-system' namespace
-  command: "{{ bin_dir }}/kubectl create -f /etc/kubernetes/kube-system-ns.yml"
+- name: Create kube system namespace
+  command: "{{ bin_dir }}/kubectl create -f {{kube_config_dir}}/{{system_namespace}}-ns.yml"
   changed_when: False
   when: kubesystem|failed and inventory_hostname == groups['kube-master'][0]
   tags: apps
 
-# Write other manifests
 - name: Write kube-controller-manager manifest
   template:
     src: manifests/kube-controller-manager.manifest.j2