Upgrade from traefik:v2.0.0-alpha4 to traefik:v2.0.0-alpha6

Hi,

We recently redid the way Traefik handles configuration flags, which includes the way an entry point and its parameters are specified.

As reference for other uses with the same problem https://docs.traefik.io/v2.0/routing/entrypoints/#configuration

Duplicate of Traefik Docker provider error, entrypoints cannot be a standalone element