CFY-7373. Rename commands from user to user group (#200)
CFY-7373. Rename commands from user to user group (#200)

* CFY-7373 Remove tenant group commands to user_group

This is to be consistent with the CLI and the documentation

* CFY-7373 Update parameter docstring

* CFY-7373 Add missing docstring

cloudify-cosmo/cloudify-rest-client