acme_certificate: Defined changed_when for calling acme.sh

roles/acme/certificate/tasks/main.yml

@@ -10,6 +10,7 @@
   args:
     chdir: "~/.acme.sh"
   register: acme_issue_result
+  changed_when: acme_issue_result.rc != 2 or "Domains not changed" not in acme_issue_result.stdout
   failed_when: acme_issue_result.rc != 0 and "Domains not changed" not in acme_issue_result.stdout
 
 - name: "Install certificate for {{ domain }}"