embed: use correct host for advertise-client-urls

Fix #7348.

#7027 broke this.
It overwriting the advertise-client-urls' host with 'localhost'.

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

embed/config.go

@@ -381,8 +381,8 @@ func (cfg *Config) UpdateDefaultClusterFromName(defaultInitialCluster string) {
 		// if client-listen-url is 0.0.0.0, just use detected default host
 		// otherwise, rewrite advertise-client-url with localhost
 		if ip != "0.0.0.0" {
-			_, acPort, _ := net.SplitHostPort(cfg.ACUrls[0].Host)
-			cfg.ACUrls[0] = url.URL{Scheme: cfg.ACUrls[0].Scheme, Host: fmt.Sprintf("localhost:%s", acPort)}
+			ahost, acPort, _ := net.SplitHostPort(cfg.ACUrls[0].Host)
+			cfg.ACUrls[0] = url.URL{Scheme: cfg.ACUrls[0].Scheme, Host: fmt.Sprintf("%s:%s", ahost, acPort)}
 			cfg.InitialCluster = cfg.InitialClusterFromName(cfg.Name)
 		}
 	}