Restore: VM with proper name should proper when finished

Currently, VM is created with final name and then restore is performed. If restore fails, some partially restored VM with good name exists.

When a VM with a correct name appears, it should have correct content.

Proposed behavior:

1. Create VM with temporary name
2. Disable backups for the VM
3. Restore
4. Enable backups for the VM
5. Rename the temporary VM