Address review comments a.d. logging.

server/etcdmain/etcd.go

@@ -57,8 +57,9 @@ func startEtcdOrProxyV2(args []string) {
 
 	err := cfg.parse(args[1:])
 	lg := cfg.ec.GetLogger()
-	cfg.ec.SetupGlobalLoggers()
-
+	// If we failed to parse the whole configuration, print the error using
+	// preferably the resolved logger from the config,
+	// but if does not exists, create a new temporary logger.
 	if lg == nil {
 		var zapError error
 		// use this logger
@@ -78,6 +79,8 @@ func startEtcdOrProxyV2(args []string) {
 		os.Exit(1)
 	}
 
+	cfg.ec.SetupGlobalLoggers()
+
 	defer func() {
 		logger := cfg.ec.GetLogger()
 		if logger != nil {