Fixes #11693 - removed 'destroy' for smart class parameter from API controllers

Fixes #10782 - global host status

• OK
• WARN
• ERROR

Plugins can add their own substatuses. These are automatically...

fixes #11175 - [API] Add taxonomies to ptables, display ptables in taxonomies

Fixes #8343 - Consolidated code paths, and removed unnecessary DB calls for parent object

Fixes #10917 - Update API docs for template combinations

Fixes #6976 - Build default PXE menu should be POST request

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 #10720 - Adds API to get host vm attributes

This exposes an API to fetch a host's vm_compute_attributes,
such as vmware cpus and memory. It lives at a separate endpoint
because it involves a fetch for data from the compute resource,
and may have different performance characteristics than the database.

fixes #9031 - Add routes to view template_combinations per hostgroup / environment

fixes #10167 - change default API from v1 to v2