Failed to delete backup cause of multiple matches

[Eric Xie]

When i use `openstack volume backup delete backup-test` to delete one backup, got error:
# openstack volume backup delete backup-test
Failed to delete backup with name or ID 'backup-test': More than one volumebackup exists with the name 'backup-test'.
1 of 1 backups failed to delete.

But in project context, there is only one backup called 'backup-test'
# openstack volume backup list
+--------------------------------------+-------------+-------------+-----------+------+
| ID | Name | Description | Status | Size |
+--------------------------------------+-------------+-------------+-----------+------+
| acc3fef8-28e6-44de-8a53-b731de9cd819 | test-b | None | error | 1 |
| a08e814b-f057-4488-998f-12408277554b | backup-test | None | available | 1 |
+--------------------------------------+-------------+-------------+-----------+------+

For all projects there are more than one.

So i think this op should be project-scoped.

[Eric Xie (eric-xie)]

Use `openstack --debug volume backup delete backup-test`, call api: http://10.110.28.20:8776/v2/187e1165ec2a40e9a72efab673e940d9/backups/detail?all_tenants=1&name=qwe.

I think all_tenants flag can not be specified.