Fix imports

Signed-off-by: Katarzyna Treder <katarzyna.treder@h-partners.com>

test/functional/tests/io/test_write_fetch.py

@@ -1,11 +1,13 @@
 #
 # Copyright(c) 2020-2022 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies Co., Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 #
-import os
 
+import os
 import pytest
 import uuid
+
 from api.cas import casadm
 from api.cas.cache_config import CacheMode, CacheLineSize, CacheModeTrait
 from core.test_run import TestRun