Move size.py to types

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

test/functional/tests/stats/test_display_statistics.py

@@ -27,7 +27,7 @@ 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.size import Size, Unit
+from types.size import Size, Unit
 
 # One cache instance per every cache mode:
 caches_count = len(CacheMode)