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

Consistent boolean values in ansible playbooks

roles/bootstrap-os/tasks/fedora-coreos.yml

@@ -28,7 +28,7 @@
   raw: "nohup bash -c 'sleep 5s && shutdown -r now'"
   become: true
   ignore_errors: true  # noqa ignore-errors
-  ignore_unreachable: yes
+  ignore_unreachable: true
   when: need_bootstrap.rc != 0
 
 - name: Wait for the reboot to complete