Do not use ‘yes/no’ for boolean values (#11472)

Consistent boolean values in ansible playbooks

roles/etcd/tasks/gen_nodes_certs_script.yml

@@ -21,7 +21,7 @@
     executable: /bin/bash
   no_log: "{{ not (unsafe_show_logs | bool) }}"
   register: etcd_node_certs
-  check_mode: no
+  check_mode: false
   delegate_to: "{{ groups['etcd'][0] }}"
   changed_when: false