swith to ca_request instead of iterating on cas

roles/lxc_guest/tasks/main.yaml

@@ -109,9 +109,8 @@
 
     - name: start sign request
       raw: "{{ cert_request | to_json }}"
-      delegate_to: "{{ item }}"
+      delegate_to: ca_request
       delegate_facts: True
-      with_items: "{{ groups['cas'] }}"
       register: request_result
       failed_when: "( request_result.stdout | from_json ).failed"
 
@@ -141,9 +140,8 @@
 
     - name: wait for cert
       raw: "{{ get_request | to_json }}"
-      delegate_to: "{{ item }}"
+      delegate_to: ca_request
       delegate_facts: True
-      with_items: "{{ groups['cas'] }}"
       register: cert_result
       failed_when: "(cert_result | from_json).stdout.failed"