fix cert_key in set_fact task

roles/lxc_guest/tasks/main.yaml

@@ -130,11 +130,7 @@
     - debug: var=cert_result verbosity=2
 
     - set_fact:
-          cert_key: "{{ cert_result.results[0].stdout|string|from_json }}"
-
-    - debug:
-        var: request_output
-        verbosity: 2
+          cert_key: "{{ cert_result.stdout | string | from_json }}"
 
     - name: Write certificate to container
       container_file_write: