At the moment all doctrine services names are prefixed with `doctrine.`. Factories consumed by `DoctrineServiceAbstractFactory` are all have service names prefixed with `doctrine.factory.`. I know that means you can't have a doctrine config `$config['doctrine']['factory']`, but why would you? To me it feels clean if all things to do with doctrine have the same service name prefix ie `doctrine` rather than having `doctrinefactory` as well.