Fixing the backwards verb/noun cli names

The cli names were backwards. instead of backup-list, list-backups
was the name. They have been reordered to match the other openstack
clients. Also added a better readme.

Change-Id: I280f637bfa7bbeaf55c70115339f430dbb279152
Fixes README and shell

Change-Id: I2beec621fce4c8c8eb90631b2e543962f31687de
Closes-Bug: #1238183