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/node/tasks/main.yml

@@ -1,4 +1,9 @@
 ---
+- set_fact:
+    standalone_kubelet: >-
+      {%- if inventory_hostname in groups['kube-master'] and inventory_hostname not in groups['kube-node'] -%}true{%- else -%}false{%- endif -%}
+  tags: facts
+
 - include: install.yml
   tags: kubelet
 

roles/kubernetes/node/tasks/nginx-proxy.yml

@@ -1,6 +1,6 @@
 ---
 - name: nginx-proxy | Write static pod
-  template: src=manifests/nginx-proxy.manifest.j2 dest=/etc/kubernetes/manifests/nginx-proxy.yml
+  template: src=manifests/nginx-proxy.manifest.j2 dest={{kube_manifest_dir}}/nginx-proxy.yml
 
 - name: nginx-proxy | Make nginx directory
   file: path=/etc/nginx state=directory mode=0700 owner=root