Etcd cluster setup makeover

The current way to setup the etc cluster is messy and buggy.

- It checks for cluster is healthy before the cluster is even created.
- The unit files are started on handlers, not in the task, so you mess with "flush handlers".
- The join_member.yml is not used.
- etcd events cluster is not configured for kubeadm
- remove duplicate runs between running the role on etcd nodes and k8s nodes

roles/etcd/tasks/install_host.yml

@@ -10,3 +10,4 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   changed_when: false
+  when: etcd_cluster_setup