Enable kubeadm etcd mode (#4818)

* Enable kubeadm etcd mode

Uses cert commands from kubeadm experimental control plane to
enable non-master nodes to obtain etcd certs.

Related story: PROD-29434

Change-Id: Idafa1d223e5c6ceadf819b6f9c06adf4c4f74178

* Add validation checks and exclude calico kdd mode

Change-Id: Ic234f5e71261d33191376e70d438f9f6d35f358c

* Move etcd mode test to ubuntu flannel HA job

Change-Id: I9af6fd80a1bbb1692ab10d6da095eb368f6bc732

* rename etcd_mode to etcd_kubeadm_enabled

Change-Id: Ib196d6c8a52f48cae370b026f7687ff9ca69c172

upgrade-cluster.yml

@@ -56,13 +56,23 @@
   any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
   roles:
     - { role: kubespray-defaults}
-    - { role: etcd, tags: etcd, etcd_cluster_setup: true }
+    - role: etcd
+      tags: etcd
+      vars:
+        etcd_cluster_setup: true
+        etcd_events_cluster_setup: false
+      when: not etcd_kubeadm_enabled | default(false)
 
 - hosts: k8s-cluster
   any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
   roles:
     - { role: kubespray-defaults}
-    - { role: etcd, tags: etcd, etcd_cluster_setup: false }
+    - role: etcd
+      tags: etcd
+      vars:
+        etcd_cluster_setup: false
+        etcd_events_cluster_setup: false
+      when: not etcd_kubeadm_enabled | default(false)
 
 - name: Handle upgrades to master components first to maintain backwards compat.
   hosts: kube-master