Remove AuthenticationManager in 3.0?

[drieseng]

Microsoft.AspNetCore.Http.Authentication.AuthenticationManager has been marked obsolete in 2.0.
Perhaps you should consider removing it (and related classes) in 3.0.

[Eilon]

Please post an announcement when this is done.

[Eilon]

Need an announcement issue!

[HaoK]

I updated the one fowler posted since he had one that covered part of this change already:

aspnet/Announcements#337