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

Consistent boolean values in ansible playbooks

playbooks/boilerplate.yml

@@ -51,7 +51,7 @@
 
 - name: Install bastion ssh config
   hosts: bastion[0]
-  gather_facts: False
+  gather_facts: false
   environment: "{{ proxy_disable_env }}"
   roles:
     - { role: kubespray-defaults }