Add etcd-events cluster for kube-apiserver (#2385)

Add etcd-events cluster for kube-apiserver

roles/etcd/templates/etcd-events-docker.service.j2

@@ -0,0 +1,18 @@
+[Unit]
+Description=etcd docker wrapper
+Wants=docker.socket
+After=docker.service
+
+[Service]
+User=root
+PermissionsStartOnly=true
+EnvironmentFile=-/etc/etcd-events.env
+ExecStart={{ bin_dir }}/etcd-events
+ExecStartPre=-{{ docker_bin_dir }}/docker rm -f {{ etcd_member_name }}-events
+ExecStop={{ docker_bin_dir }}/docker stop {{ etcd_member_name }}-events
+Restart=always
+RestartSec=15s
+TimeoutStartSec=30s
+
+[Install]
+WantedBy=multi-user.target