Factorize some identical playbooks steps into their own sub-playbooks (#10633)

* Factorize identical playboooks steps in sub-playbooks

* Copy legacy_groups.yml into its sole user

playbooks/recover_control_plane.yml

@@ -1,17 +1,6 @@
 ---
-- name: Check ansible version
-  import_playbook: ansible_version.yml
-
-- name: Ensure compatibility with old groups
-  import_playbook: legacy_groups.yml
-
-- name: Install bastion ssh config
-  hosts: bastion[0]
-  gather_facts: False
-  environment: "{{ proxy_disable_env }}"
-  roles:
-    - { role: kubespray-defaults}
-    - { role: bastion-ssh-config, tags: ["localhost", "bastion"]}
+- name: Common tasks for every playbooks
+  import_playbook: boilerplate.yml
 
 - name: Recover etcd
   hosts: etcd[0]