Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "nova/tests/unit/virt/libvirt/test_driver.py", line 3387, in test_get_guest_config_with_virtio_scsi_bus_bdm
        disk_info, [], bd_info)
      File "nova/virt/libvirt/driver.py", line 4478, in _get_guest_config
        flavor, guest.os_type)
      File "nova/virt/libvirt/driver.py", line 3519, in _get_guest_storage_config
        cfg = self._get_volume_config(connection_info, info)
      File "nova/virt/libvirt/driver.py", line 1104, in _get_volume_config
        return vol_driver.get_config(connection_info, disk_info)
      File "nova/virt/libvirt/volume/volume.py", line 150, in get_config
        self).get_config(connection_info, disk_info)
      File "nova/virt/libvirt/volume/volume.py", line 48, in get_config
        self.connection._host.get_version(),
    AttributeError: 'Host' object has no attribute '_host'