Fixes #6608 - expose disk usage info through available_storage_domains API

fixes #6696 - API v2 - specify 'host' as the key in which parameters will be wrapped rather than Host::Base

Fixes #6400 - Show * next to required form fields

fixes #6964 - replace default scope that hides users with explicit scope

Fixes #6560 - Extract puppet parsing logic

Fixes #6962 - Use as_admin instead of find_by_login for usergroup tests

Fixes #6891: Taxonomies couldn't be seeded after initial run of seeds.

On a clean run of seeds, a seed prior to the taxonomies sets User.current.
On subsequent runs, errors are thrown since User.current is not thrown
and taxonomy creation expects this.

Fixes #5734 - API for external groups management

fixes #6861 - provide a way to detect host group provisioning

fixes #6881 - check if in rake when validating template changes