Move size.py to types

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

test/functional/tests/initialize/test_negative_load.py

@@ -8,7 +8,7 @@ import pytest
 from api.cas import casadm, casadm_parser, cli, cli_messages
 from core.test_run import TestRun
 from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
-from test_utils.size import Size, Unit
+from types.size import Size, Unit
 
 
 @pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))