enhance formatting in lxc_guest playbook

roles/lxc_guest/tasks/main.yaml

@@ -74,7 +74,7 @@
     - debug: var=cert_request verbosity=2
 
     - name: start sign request
-      raw: "{{ cert_request|to_json }}"
+      raw: "{{ cert_request | to_json }}"
       delegate_to: "{{item}}"
       delegate_facts: True
       with_items: "{{groups['cas']}}"