etcdctl: add etcdctl snapshot pipe command

client/v3/snapshot/v3_snapshot.go

@@ -44,7 +44,7 @@ func hasChecksum(n int64) bool {
 // context.DeadlineExceeded). Make sure to specify only one endpoint
 // in client configuration. Snapshot API must be requested to a
 // selected node, and saved snapshot is the point-in-time state of
-// the selected GetSnapshotWithVersion. Etcd < v3.6 will return "" as version.
+// the selected node. Etcd < v3.6 will return "" as version.
 func GetSnapshotWithVersion(ctx context.Context, lg *zap.Logger, cfg clientv3.Config, f *os.File) (string, error) {
 	cfg.Logger = lg.Named("client")
 	if len(cfg.Endpoints) != 1 {
@@ -103,10 +103,10 @@ func SaveWithVersion(ctx context.Context, lg *zap.Logger, cfg clientv3.Config, d
 		return "", fmt.Errorf("could not open %s (%v)", partPath, err)
 	}
 	lg.Info("created temporary db file", zap.String("path", partPath))
-
+	
 	defer os.RemoveAll(partPath)
 	defer f.Close()
-	
+
 	return GetSnapshotWithVersion(ctx, lg, cfg, f)
 }