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/install_etcd.yml

@@ -0,0 +1,31 @@
+---
+- 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"