Comment 5 for bug 1801316

Reviewed: https://review.openstack.org/615455
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=b90a13d07dcf230a509cc93a4c864a20494cf5e7
Submitter: Zuul
Branch: stable/rocky

commit b90a13d07dcf230a509cc93a4c864a20494cf5e7
Author: zhangbailin <email address hidden>
Date: Sun Nov 4 19:25:59 2018 -0500

    Change the matching method of the backup driver

    The backup driver name is configured uniformly from the Stein version.
    For example, support for
    'cinder.backup.drivers.service.ServiceBackupDriver' does not support
    'cinder.backup.drivers.service'.

    However, the above two backup drivers are supported in a stable version
    before Rocky (including Rocky).

    For the same storage backend, if the backup driver used to create the
    backup file is 'cinder.backup.drivers.service.ServiceBackupDriver',
    the backup driver configured when restoring the backup is
    'cinder.backup.drivers.service'. The recovery of the backup file will
    fail because the drivers do not match.

    Therefore, the processing of this method needs to be compatible with the
    backup driver for different configurations of the same backend.

    The above 'service' is a proxy, it can be one of {'swift', 'nfs',
    'ceph', 'glusterfs', 'google', 'tsm', 'posix'}

    Closes-Bug: #1801316
    Change-Id: I1d7ee395c89beda0e50cbe26b4abb4fc7749e15e