Update to Ansible 2.2.1.0 and adjust all file mode settings to provide them as strings

tasks/main.yml

@@ -19,6 +19,6 @@
       dest='/etc/ssl/td-agent/key.pem'
       owner='root'
       group='root'
-      mode=644
+      mode='644'
 
   when: '"fluentd" not in excluded_roles'