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

tasks/main.yml

@@ -12,4 +12,4 @@
     - name: Import fluentd-client
       import_tasks: fluentd-client.yml
 
-  when: not excluded_roles or "fluentd-client" not in excluded_roles and fluentd_host is defined and fluentd_host != ""
+  when: (not excluded_roles or "fluentd-client" not in excluded_roles) and fluentd_host is defined and fluentd_host != ""