Fixes #19789 - fix Layout/SpaceAroundOperators cop

Fixes #23605 - Port robottelo tests - smart_proxy

Fixes #21424 - use factory_bot_rails

refs #13968 - use existing feature to ensure reliable comparison

Feature.name_map may have returned either the new factory-based feature
or the existing fixture-based feature for the name 'TFTP', causing
intermittent failures.

Fixes #13968 - Add error when no known proxy features found

fixes #16557 - move tests into modern Rails layout

Models, controllers, mailers and helpers are now in test/ subdirs
matching app/ subdirs. Service, miscellaneous and old test/lib/ tests
are now in test/unit/ separated from models, which obsoletes the custom...