Replace the repos in the portal with dynamodb and core
* Remove all data stores from the portal
* Use the user and user change repository from core and dynamodb
* Remove the UserAccount type, use core User instead
* Remove the UserChangeLog types, use core UserChange instead
* Clean up duplication in VinylDNS
* Moved `Module` to `modules.VinylDNSModule`. The reason is that
you cannot disable the "default" module for unit tests.
* Use mock configuration for VinylDNSSpec and FrontendControllerSpec.
The mock app configuration is what allows us to run without dynamodb
* Added a TestApplicationData trait to cut down on duplication
