We should override `has` on `ControllerManager` and force default value to `false`. This method should be work like `get` ... In my opinion, this problem must be fix on ZF2.

If we enforce calling `has` with the additionnal `false` parameter, we may have problems depending on the `ServiceLocatorInterface` used because `get` and `has` definitions are not the same between `AbstractPluginManager` and `ServiceManager` instance.

Does anyone else could give its opinion ?