Allow to configure TLS on the entrypoint in Traefik 2.0

[apollo13]

As far as I can see there is no way in Traefik 2.0 to force an entrypoint to allow only https connections. One can redirect via a router, but this is rather late imo and puts the responsibility onto the router. Having a global option would make the individual router configuration via docker labels etc easier.

[apollo13]

To extend on the description from above my usecase is the following: I am using traefik as an ingress and want to ensure that:

• all http requests are redirected to https
• no http traffic is returned from traefik aside from the https redirect from above
• this should be doable without having to do this for every router/service

Basically as a system administrator I want to ensure that the system is secure without having to rely on the "users" to configure tls properly via labels etc…

[ldez]

Duplicate of #4863