etcdtcl: fix etcdctl cluster-health ignores SSL settings

etcdctl reconnects to the leader, but was not picking up ssl settings in this
case, which causes it to show unhealthy when this is not the case.

Fixes #2373

etcdctl/command/cluster_health.go

@@ -54,6 +54,7 @@ func handleClusterHealth(c *cli.Context) {
 
 	// is raft stable and making progress?
 	client = etcd.NewClient([]string{ep})
+	client.SetTransport(tr)
 	resp, err := client.Get("/", false, false)
 	if err != nil {
 		fmt.Println("cluster is unhealthy")