Add detail specific fields check in list_backups

Now list_backups is called twice and both with
detail=True and without specific fields check.
This is to:
1. add detail specific fields check when detail=True
2. make one calling of list_backups to use detail=False

Change-Id: Iafbcc2b3048f5fcf1e453da0e4821268ffa0be59
2 files changed