code: def _configure_manager(self):
          
          self._manager = CloudBlockStorageManager(self,
                  resource_class=CloudBlockStorageVolume, response_key="volume",
                  uri_base="volumes")
          self._types_manager = BaseManager(self,
                  resource_class=CloudBlockStorageVolumeType,
                  response_key="volume_type", uri_base="types")
          self._snapshot_manager = CloudBlockStorageSnapshotManager(self,
                  resource_class=CloudBlockStorageSnapshot,
                  response_key="snapshot", uri_base="snapshots")
docs: Create the manager to handle the instances, and also another
          to handle flavors.