fixes #2951 - Host API documentation lacks compute_resource_id

fixes #3256 - include members in usergroup show

fixes #3267 - API v1 compatibility for /api/hosts

fixes #3140 - API to allow importing of puppet classes

fixes #3101 - list available images for CRs, add iam_role field to images API

fixes #3052 - reports#show json rabl template to match as_json output that was removed

fixes #2969 - remove all legacy api code in UI controllers, add deprecation response

fixes #2989 - missing fields in host API output (API v1 and v2)

fixes #2933 - add missing fields to installation media API

fixes #863 - added ldap_filter to LDAP auth sources to filter lookups using RFC 2254 filters