Support usage of versioned API paths

[dvaccarosenna]

CP4NA now features versioned paths (e.g. /api/v1/). We should update the lmctl client to use the versioned paths.

Unversioned paths are still supported so this change is not urgent.

Consideration needs to be given to how we will handle multiple versions of the same API moving forward. Either:

• each release of lmctl will use the latest version of the API at the time
• we provide an option to specify the version of the API the user would like to use

In addition, it may be useful if lmctl attempts to detect the version of the API supported by any given CP4NA environment.