OS tools refactor

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

test/functional/tests/lazy_writes/cleaning_policy/test_alru.py

@@ -14,7 +14,8 @@ from core.test_run import TestRun
 from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from test_tools.fio.fio import Fio
 from test_tools.fio.fio_param import ReadWrite, IoEngine
-from test_utils.os_utils import Udev, kill_all_io
+from test_tools.os_tools import kill_all_io
+from test_tools.udev import Udev
 from types.size import Size, Unit
 from types.time import Time