Add support volume backup_driver config option

The depends-on patch adds a new backup_driver option to tempest.
The goal of this change is to be able to do a proper cleanup of
containers when swift is used as a backup driver.

Thich change makes sure that the new option is properly set to
"swift" when Swift is used as the driver.

Depends-On: https://review.opendev.org/c/openstack/tempest/+/896011/13
Change-Id: I76e7fd712ee352051f8aa2f2912a29abad9ad017
1 file changed