Fix default Swift URL in Backup service

Change-Id: I860fdf2173c2ea0a3a91f310455927f8115b14fe
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
(cherry picked from commit 7420821aa6f609a7bf04f2eb9caf62807ea93d40)
Add Ceph as backup backend support

Cinder backup could use Ceph as backend.
This patch aims to create cinder::backup::ceph class to use this driver.

Change-Id: Ib82b94f3e2d5d9e2287a570a435d469656c9a756
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
(cherry picked from commit c00c752994584600465e36cdf96f547fbe9696e5)
Merge "Fix default Swift URL in Backup service" into stable/havana
Merge "Add Ceph as backup backend support" into stable/havana