Currently, only deleting via IDs is possible for groups, projects
and users.
We should have an optional --domain argument that allows for
a name to be specified for the resource. (Since these are all
namespaced by domains).
Change-Id: I18ace3db85a3969f0b97678d432d6f8368baa9cd
* Sort by command objects
* Drop the comparison to the project CLIs
* Minor updates to command help to match docs
Initially include the cross-API commands to establish the structure and format.
Change-Id: I77a7b3c89e088b66aa62941e29ce0b65b532285b