add logs for remote file loading

weed/storage/volume_loading.go

@@ -83,6 +83,7 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 
 	if alreadyHasSuperBlock {
 		err = v.readSuperBlock()
+		glog.V(0).Infof("readSuperBlock volume %d version %v", v.Id, v.SuperBlock.Version)
 	} else {
 		if !v.SuperBlock.Initialized() {
 			return fmt.Errorf("volume %s not initialized", v.FileName(".dat"))