During the Queens cycle, Cinder introduced the ability to specify the
backup driver via class name and deprecated backup driver initialization
using the module name. (Id6bee9e7d0da8ead224a04f86fe79ddfb5b286cf)
Legacy support for initialization by module name was dropped in Stein.
(I3ada2dee1857074746b1893b82dd5f6641c6e579)
This change will support both methods of initialization and leave the
driver defaults enabled for module based initialization (valid through
Rocky images).
This change has been tested using the OSH default Cinder (Ocata) images
and StarlingX images based on master (Train).
Change-Id: Iec7bc6f4dd089aaa08ca652bebd9a10ef49da556
Signed-off-by: Robert Church <robert.church@windriver.com>
aa4ca5ad56