Offline control plane recover (#10660)

* ignore_unreachable for etcd dir cleanup

ignore_errors ignores errors occur within "file" module. However, when
the target node is offline, the playbook will still fail at this task
with node "unreachable" state. Setting "ignore_unreachable: true" allows
the playbook to bypass offline nodes and move on to proceed recovery
tasks on remaining online nodes.

* Re-arrange control plane recovery runbook steps

* Remove suggestion to manually update IP addresses

The suggestion was added in 48a182844c 4
years ago. But a new task added 2 years ago, in
ee0f1e9d58, automatically update API
server arg with updated etcd node ip addresses. This suggestion is no
longer needed.

roles/recover_control_plane/etcd/tasks/main.yml

@@ -39,6 +39,7 @@
   delegate_to: "{{ item }}"
   with_items: "{{ groups['broken_etcd'] }}"
   ignore_errors: true  # noqa ignore-errors
+  ignore_unreachable: true
   when:
     - groups['broken_etcd']
     - has_quorum