Use validator in Core
Remove local config validator
Use Core's Config Loader
Remove local config loader
This isn't an integration test

It also fails, because the Core logger now receives the error, not the EdgeGateway logger. However, this is not a great way to test it. This will be dealt with by fixing a combination of the issues raised in the story - injecting the loaded config and testing the schemas.
Requires Core v0.0.9 for config loader & validator
Merge pull request #28 from alphagov/move-config-to-core

[#65625634] Move config to core