Make etcdctl connect to localhost out of the box (#5643)

* Make etcdctl connect to localhost out of the box

* etcdctl envs: use admin-.pem instead of member-.pem

roles/etcd/templates/etcd.env.j2

@@ -42,3 +42,9 @@ ETCD_PEER_CLIENT_CERT_AUTH={{ etcd_peer_client_auth }}
 {% if host_architecture != "amd64" -%}
 ETCD_UNSUPPORTED_ARCH={{host_architecture}}
 {%- endif %}
+
+# CLI settings
+ETCDCTL_ENDPOINTS=https://127.0.0.1:2379
+ETCDCTL_CA_FILE={{ etcd_cert_dir }}/ca.pem
+ETCDCTL_KEY_FILE={{ etcd_cert_dir }}/admin-{{ inventory_hostname }}-key.pem
+ETCDCTL_CERT_FILE={{ etcd_cert_dir }}/admin-{{ inventory_hostname }}.pem