In the following scenario root volume gets unremoved
Steps to reproduce the issue
1. Create a VM.
2. Stop this VM.
3. On the page of the volume of the VM, click 'Download Volume' icon.
4. Wait for the popup screen to display and cancel out with/without clicking the download link.
5. Destroy the VM
Even after the corresponding VM is deleted,expunged, the root-volume is left in 'Expunging' state unremoved.