fixes #4198 - API v2 - add child nodes to show responses. Ex. architecture should show operating systems node
fixes #4349 - API v2 - add location and organization child nodes to user, domain, subnet, etc show json templates
fixes #3876 - API find_resource by name even if name starts with integer
fixes #4015 - support oVirt using templates like images
fixes #4394 - generate class method on AR collections to retrieve used_taxonomy_ids
Usergroup roles support

Working version which currently breaks a lot of tests however is ready
for testing by devs. There are still things to improve. Also we enable
users that can edit usergroups a privilege escalation atm.
Fixed tests
Add cycle detection and prevention in usergroups
Add migration for caching existing user roles
Fixed issue for redundant structures
Recache after remove

The only way to keep correct cache without complete recalculation or
having complete paths stored
With this we don't even need user_membership caching
Usergroup membership caching
Admin flag can be assigned to usergroup
Small refactorings
Roles design
Reviews
CRUD for filters
Add taxonomies to filters
Permission evaluation logic refs #3804