* Update Traefik 1.x to v1.7.20 for integration tests
* Add suite for Traefik 2.x
* Refactor Traefik2 suite to utilise Docker labels
* Move Traefik2 middleware definition to a file based provider
* Expose Traefik2 dashboard
The API/Dashboard can be reached at https://traefik.example.com:8080/
* Move Traefik frontend/backend definitions to Docker labels
* Move Traefik2 router/service definitions to Docker labels
* Normalise all Traefik configuration via labels and commands
When the the middleware issue with Traefik 2.x (#476) is resolved this means all Traefik related configuration can be self-contained within the respective docker-compose.yml files.
* Define ports for Authelia frontend/backend services
* Adjust Traefik2 suite to new dev workflow
* Normalise all Traefik2 middlewares via labels
* Fix typo in middleware and comment labels specifying Traefik version
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