Remove unused import. Fix class reference
Typo and reduce locals
Properly merge Saltfile with config
Explicit attribute
`utils` are already imported
Standardize default values on help messages
Allow the versions report to be overridden
Add names as a positional argument
Fix absolute paths assurance to options in group.

Remainder of args are stored in names.
Show the default value
Handle salt-cloud --function with a custom callable action
`salt-key` `--list` now uses a list of choices.

`--list-all` is now deprecated. Added a custom action for this.
Add `warn_until` so it's not forgotten.
Make use of the `DeprecatedAction` instead of `process_*`