This not only improves flexability for ceph client deployment, but also removes hardcoded logic on when Ceph client should be deployed with Cinder Backup. For instance, cinder backup still requires to have Ceph client, when Volume is stored on ceph, but backup driver is set to Swift/S3/etc. Change-Id: I6f7b678b645b203ae30625c3c91e88a33f2e4e6b Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>