Move ::api_module to Base class; use #delete for options

- Override ::api_module definition is meant to be overridden
  in subclasses as needed
- Use #delete for passed options so we don't send extraneous
  params with cPanel API calls
- Remove unneeded ::api_module definitions in subclasses
- Remove explicit :api_module params used in subclasses
- Regenerate VCR cassettes