We should provide the ability to customize private of object HEAD / DELETE ops. Implement `UseKey` method on `PrmObjectHead` / `PrmObjectDelete` types. Sign requests with the specified key if called. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Delete
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Also remove unused methods of `pool.Client` and `pool.Pool`. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>