While cinder-backup has it's own service and group, we still use
cinder-volume for conditioning some configuration, which makes
it untrivial to separate cinder-volume from cinder-backup in deployments
This improves some crucial conditions to work for cinder-backup
in case it's deployed separately.
Change-Id: Ie74931133b7e2bf4262bb48134e80a64c9779d04
Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>