non-recursive directory deletion

fix a problem during git checkout a different version, where updated directories are deleted even though the directory is not empty.

weed/mount/weedfs_dir_mkrm.go

@@ -104,7 +104,7 @@ func (wfs *WFS) Rmdir(cancel <-chan struct{}, header *fuse.InHeader, name string
 
 	glog.V(3).Infof("remove directory: %v", entryFullPath)
 	ignoreRecursiveErr := true // ignore recursion error since the OS should manage it
-	err := filer_pb.Remove(wfs, string(dirFullPath), name, true, true, ignoreRecursiveErr, false, []int32{wfs.signature})
+	err := filer_pb.Remove(wfs, string(dirFullPath), name, true, false, ignoreRecursiveErr, false, []int32{wfs.signature})
 	if err != nil {
 		glog.V(0).Infof("remove %s: %v", entryFullPath, err)
 		if strings.Contains(err.Error(), filer.MsgFailDelNonEmptyFolder) {