Fixes #6854 - Api status allowed for all users

(cherry picked from commit 7267e023e6db34db8ebb3ba59f4be4b8d0e07624)

Fixes #11206 - plugin API now expose default role permissions

(cherry picked from commit 758d57a3c067dbd07f5bfbd66617b6865dab9d66)

Fixes #11035 - template preview feature

(cherry picked from commit de9e7adaa579db01d043d6a04a83c946a3d33850)

Fixes #10635 - Formalize deprecation warning

(cherry picked from commit 319d1ffbed54f2c9eb988d132ec1586fb4d7c428)

Fixes #10713 - improved backtrace logging

• full trace in 500 page in production shows really the full trace
• Foreman::Logging.exception as an unified entry point for exceptions logging
• the backtrace cleaner doesn't delete the plugins
• the orchestration exceptions gets the backtrace covered by logger...

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 #10487: Add custom logging support

This change moves away from the Rails logger to the 'logging' gem
to support more configurability of logging. Further, this allows for
the creation of custom loggers that plugins can then create during
registration (with `logger`) or through settings....

Fixes #8106 - Dashboard rewrite to allow better customization

fixes #8516 - removing the require 'fog' from the project, requiring only what we use