fixes #11649 - taxonomies api - add description to base.json.rabl

Adding the 'description' to the base.json.rabl so that it is displayed
when a user performs commands like 'organization list' from hammer-cli-katello.

E.g.

hammer> organization list
---|----------------------|----------------------|---------------...

Fixes #7096 - Adds STI to templates

This commit converts Ptables to be just another type of Template so it
gets the same features as ConfigTemplate. ConfigTemplate was renamed to
ProvisioningTemplate to reflect UI and the name under it's commonly known.

Fixes #10002 - Add attribute ancestry to taxonomies API v2

Refs #3809 - Remove classcheck cop

Refs #3809 - Remove cops for empty lines

Fixes #7733 - Remove hosts.yml fixtures and use FactoryGirl instead

Fixes #6786 - Handle error when no taxonomy params get sent

Basically, no organization params are getting sent as the bug reporter is not
using json and not using wrapped params. You can also test this by doing:

curl -X POST http://localhost:3000/api/v2/organizations...

fixes #1809 - foreman realm integration

fixes #4393 - rename ancestry label to title

fixes #4349 - API v2 - add location and organization child nodes to user, domain, subnet, etc show json templates

fixes #4198 - API v2 - add child nodes to show responses. Ex. architecture should show operating systems node

fixes #3912 - add inheritance for locations / organizations

fixes #3519 - taxonomies include authorization module

fixes #3491 - API v2 rabl templates base, main, show for each controller

fixes #3646 - API v2 change default root name for api json single object response to no root node but make it configurable

fixes #3018 - API v2 metadata for pagination, search, order in index collection json response

fixes #3011 - default root node name for api collections json response to :results but make it configurable

fixes #2239 API v2 CRUD for locations and organizations and added nested loc/org