s3: move buckets folder configuration to filer

weed/server/filer_grpc_server.go

@@ -308,5 +308,6 @@ func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.
 		Collection:  fs.option.Collection,
 		Replication: fs.option.DefaultReplication,
 		MaxMb:       uint32(fs.option.MaxMB),
+		DirBuckets:  fs.option.DirBucketsPath,
 	}, nil
 }

weed/server/filer_server.go

@@ -46,6 +46,7 @@ type FilerOption struct {
 	DisableHttp        bool
 	Port               int
 	recursiveDelete    bool
+	DirBucketsPath     string
 }
 
 type FilerServer struct {