cp file can work

1. consolidate to filer_pb.FileChunk
2. dir add file, mkdir
3. file flush, write

updates having issue

weed/server/filer_server_handlers_admin.go

@@ -6,6 +6,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"strconv"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 )
 
 func (fs *FilerServer) registerHandler(w http.ResponseWriter, r *http.Request) {
@@ -22,9 +23,9 @@ func (fs *FilerServer) registerHandler(w http.ResponseWriter, r *http.Request) {
 		Attr: filer2.Attr{
 			Mode: 0660,
 		},
-		Chunks: []filer2.FileChunk{{
-			Fid:  filer2.FileId(fileId),
-			Size: fileSize,
+		Chunks: []*filer_pb.FileChunk{{
+			FileId: fileId,
+			Size:   fileSize,
 		}},
 	}
 	err = fs.filer.CreateEntry(entry)