When we show a volume backup by name, it calls the get_backup
method in SDK which is only used for getting a backup by ID.
This patch modifies the approach to call find_backup method
which first tries the find by ID and then find by name logic
eventually returning the backup details.
Story: 2011234
Task: 51127
Change-Id: I926d8de9810fcf2e5335bbe35aaab15e1e36a5cb
b6b18489b0