If we firstly create a incremental backup without parent backup
or using unavailable backup file, like execute the command:
``cinder backup-create --name test_backup --incremental
2e3d9d0b-6b33-4cfe-a7c2-656415ee6f61``.
To satisfy one of the above reasons, we will be received an error
info: "Invalid backup: No backups available to do an incremental
backup. (HTTP 400)". But the reserved value of the ``quota_usages``
table has been updated, so we need to roll back the ``quota_usages``
table. Otherwise, after repetitive operation for many times,
create backup will be failed.
Co-Authored-By: Brin Zhang <zhangbailin@inspur.com>
Closes-Bug: #1809323
Change-Id: I1870633a5505bdb60d529fbda3147378b75e2b07
a62fabfa65