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/cluster.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: Gather facts
   import_playbook: facts.yml
@@ -28,35 +17,7 @@
     - { role: download, tags: download, when: "not skip_downloads" }
 
 - name: Install etcd
-  hosts: etcd:kube_control_plane
-  gather_facts: False
-  any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
-  environment: "{{ proxy_disable_env }}"
-  roles:
-    - { role: kubespray-defaults }
-    - role: etcd
-      tags: etcd
-      vars:
-        etcd_cluster_setup: true
-        etcd_events_cluster_setup: "{{ etcd_events_cluster_enabled }}"
-      when: etcd_deployment_type != "kubeadm"
-
-- name: Install etcd certs on nodes if required
-  hosts: k8s_cluster
-  gather_facts: False
-  any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
-  environment: "{{ proxy_disable_env }}"
-  roles:
-    - { role: kubespray-defaults }
-    - role: etcd
-      tags: etcd
-      vars:
-        etcd_cluster_setup: false
-        etcd_events_cluster_setup: false
-      when:
-        - etcd_deployment_type != "kubeadm"
-        - kube_network_plugin in ["calico", "flannel", "canal", "cilium"] or cilium_deploy_additionally | default(false) | bool
-        - kube_network_plugin != "calico" or calico_datastore == "etcd"
+  import_playbook: install_etcd.yml
 
 - name: Install Kubernetes nodes
   hosts: k8s_cluster