Fixes #11444 - Correctly count hosts in domain

Only hosts that have a primary nic assigned to a domain should be
counted in the domain host count. Previous implementation was flawed in
that it only updated the counter in certain occasions and not all,
leading sometimes to incorrect host counts....

Fixes #11924 - Substitute .scoped by .where(nil) to force return relation

On Rails 4 .scoped is deprecated. Calling .all on the model returns the
equivalent ActiveRecord relation object on Rails 4, but on Rails 3 it
returns an Array right away.

A proper replacement we can use is where(nil) - it's ugly but it returns...

Fixes #10988 - Remove 1.11 deprecations

Fixes #12067 - Delegated methods need to be public, not protected

generate_pxe_template and require_ip_validation? are delegated to
primary interface on Host::Managed. However, these methods are
protected. On Rails 4, protected methods cannot be called through a...

Fixes #12034 - scope nics to validate uniqueness against

Fixes #11034 - custom uniqueness validations for interface attributes

Fixes #11696 - remove unused code

Refs #3809 - Stabby lambda syntax for oneliners

I started by spotting log.rb which didn't have a lambda wrapping its
default scope, as needed by Rails 4. Since the style guide and most
Rails 4 documents used the stabby lambda, I turned on the cop so that we...

Fixes #11258 - validation handles blank provider

Refs #3809 - Enable cop Style/IfUnlessModifier