Merge pull request kubernetes#58685 from tsmetana/fix-cinder-resize

Automatic merge from submit-queue (batch tested with PRs 58539, 58685). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Openstack: Fill size attribute for the V3 API volumes

The getVolume method in OpenStack provider is not filling the Size for the V3 API type volumes. This
breaks the PV resizing of Cinder volumes which compares the existing volume size with the new request. This leads to redundant volume resize calls to the cloud provider that end with errors.

cc: @gnufied

```release-note
NONE
```

pkg/cloudprovider/providers/openstack/openstack_volumes.go

@@ -222,6 +222,7 @@ func (volumes *VolumesV3) getVolume(volumeID string) (Volume, error) {
 		ID:     volumeV3.ID,
 		Name:   volumeV3.Name,
 		Status: volumeV3.Status,
+		Size:   volumeV3.Size,
 	}
 
 	if len(volumeV3.Attachments) > 0 {