Fix imports

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

test/functional/tests/initialize/test_initialize_runlevel.py

@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2020-2021 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies Co., Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -7,7 +8,6 @@ import os
 import pytest
 import time
 
-import test_tools.runlevel
 from api.cas import casadm, casadm_parser
 from api.cas.cache_config import CacheMode
 from api.cas.init_config import InitConfig
@@ -17,7 +17,7 @@ from test_tools.fs_tools import Filesystem
 from test_tools.fio.fio import Fio
 from test_tools.fio.fio_param import ReadWrite, IoEngine
 from test_tools.os_tools import sync, drop_caches
-from test_tools.runlevel import Runlevel
+from test_tools.runlevel import Runlevel, change_runlevel
 from type_def.size import Size, Unit
 
 
@@ -38,7 +38,7 @@ def test_init_reboot_runlevels(runlevel, cache_mode):
           - Cache should be loaded successfully after reboot.
     """
     with TestRun.step(f"Set runlevel to {runlevel.value}."):
-        test_tools.runlevel.change_runlevel(runlevel)
+        change_runlevel(runlevel)
 
     with TestRun.step("Prepare CAS device."):
         cache_disk = TestRun.disks['cache']
@@ -88,5 +88,5 @@ def test_init_reboot_runlevels(runlevel, cache_mode):
     with TestRun.step("Stop cache and set default runlevel."):
         if len(caches) != 0:
             casadm.stop_all_caches()
-        test_tools.runlevel.change_runlevel(Runlevel.runlevel3)
+        change_runlevel(Runlevel.runlevel3)
         TestRun.executor.reboot()