| Define volume transfers service clients as libraries. |
| The following volume transfers service clients are defined as library interface. |
| Deprecate volume v2 transfers resource methods from volumes_client(v2) libraries. |
| Same methods are available in new transfers service client: transfers_client(v2) |
| The following methods of volume v2 volumes_clients have been deprecated: |
| * create_volume_transfer (v2.volumes_client) |
| * show_volume_transfer (v2.volumes_client) |
| * list_volume_transfers (v2.volumes_client) |
| * delete_volume_transfer (v2.volumes_client) |
| * accept_volume_transfer (v2.volumes_client) |