Fix creation and sync of etcd certs

Admin certs only go to etcd nodes
Only generate cert-data for nodes that need sync

roles/etcd/tasks/check_certs.yml

@@ -28,7 +28,7 @@
 
 - name: "Check certs | check if a cert already exists"
   stat:
-    path: "{{ etcd_cert_dir }}/node-{{inventory_hostname}}-key.pem"
+    path: "{{ etcd_cert_dir }}/{{ item }}"
   register: etcdcert
   with_items:
     - ca.pem