Fixes #10550 - Settings API will not update when value parameter is missing

Fixes #6854 - Api status allowed for all users

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

Fixes #11078 - Substitute find_all_by by where to comply with Rails 4

This commit takes away all instances up to this point of find_all_by to
improve Rails 4 compatibility. They are substituted by .where calls.

Fixes #10356 - changed the POST/PUT RABL template to be the same as the GET template

HTTP response code standardized to 201 on create.

Fixes #11033 - adding missing params to auth_source ldap API docs

Refs #3809 - Style/blocks cop enabled

Fixes #10635 - Formalize deprecation warning

Fixes #10963 - partition table can't access os ids

Fixes #10917 - Update API docs for template combinations