ansible-playbooks/general#85 Fix some complex when statements

tasks/main.yml

@@ -12,4 +12,4 @@
     - name: Import jailkit
       import_tasks: jailkit.yml
 
-  when: not excluded_roles or "jailkit" not in excluded_roles and jailkit
+  when: (not excluded_roles or "jailkit" not in excluded_roles) and jailkit