[#220] blobstor: Implement "small" operations

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/blobstor/delete_small.go

@@ -19,5 +19,5 @@ type DeleteSmallRes struct{}
 //
 // Returns ErrObjectNotFound if there is no object to delete.
 func (b *BlobStor) DeleteSmall(prm *DeleteSmallPrm) (*DeleteSmallRes, error) {
-	panic("implement me")
+	return b.blobovniczas.delete(prm)
 }

pkg/local_object_storage/blobstor/get_range_small.go

@@ -19,6 +19,6 @@ type GetRangeSmallRes struct {
 //
 // Returns any error encountered that
 // did not allow to completely read the object payload range.
-func (b *BlobStor) GetRangeSmall(prm *GetRangeBigPrm) (*GetRangeBigRes, error) {
-	panic("implement me")
+func (b *BlobStor) GetRangeSmall(prm *GetRangeSmallPrm) (*GetRangeSmallRes, error) {
+	return b.blobovniczas.getRange(prm)
 }

pkg/local_object_storage/blobstor/get_small.go

@@ -1,9 +1,5 @@
 package blobstor
 
-import (
-	"github.com/pkg/errors"
-)
-
 // GetSmallPrm groups the parameters of GetSmallPrm operation.
 type GetSmallPrm struct {
 	address
@@ -23,5 +19,5 @@ type GetSmallRes struct {
 // Returns any error encountered that
 // did not allow to completely read the object.
 func (b *BlobStor) GetSmall(prm *GetSmallPrm) (*GetSmallRes, error) {
-	return nil, errors.New("method GetSmall is not implemented yet")
+	return b.blobovniczas.get(prm)
 }