Current backup_id field may contain unsupported
characters for HTTP requests. It causes problems with
/v1/backups/{backup_id} requests. Proposed solution:
use UUID as backup_id instead of
'container_hostname_backupname_timestamp_level' pattern
for define backup_id.
Change-Id: I38e2ed52ab375ea0705cdb88f82e5e66cef5cd39
Closes-Bug: #1645110
Closes-Bug: #1618030
Signed-off-by: Ruslan Aliev <raliev@mirantis.com>