fix requested_size logic for test_fs_overhead tests. (RedHatQE#2200)

Signed-off-by: Vamsi Krishna Siddu <vamsikrishna.siddu@ibm.com>

Author: vamsikrishna-siddu

tests/storage/fs_overhead/test_fs_overhead.py

@@ -93,7 +93,11 @@ def test_import_vm_with_specify_fs_overhead(updated_fs_overhead_20_with_hco, vm_
             pvc=PersistentVolumeClaim(name=vm_metadata["name"], namespace=vm_metadata["namespace"])
         ),
         requested_size=bitmath.GiB(
-            int(vm_for_fs_overhead_test.data_volume_template["spec"]["storage"]["resources"]["requests"]["storage"][0])
+            int(
+                bitmath.parse_string_unsafe(
+                    vm_for_fs_overhead_test.data_volume_template["spec"]["storage"]["resources"]["requests"]["storage"]
+                ).value
+            )
         ),
     )
 
@@ -105,5 +109,5 @@ def test_upload_dv_with_specify_fs_overhead(
 ):
     assert_fs_overhead_added(
         actual_size=get_pvc_size_gib(pvc=uploaded_cirros_dv.pvc),
-        requested_size=bitmath.GiB(int(Images.Cirros.DEFAULT_DV_SIZE[0])),
+        requested_size=bitmath.GiB(int(bitmath.parse_string_unsafe(Images.Cirros.DEFAULT_DV_SIZE).value)),
     )