IIS in-process hosting moved out of ASP.NET Core 2.1

[shirhatti]

We are moving IIS in-process hosting out of the ASP.NET Core 2.1 to give more time to validate the design and implementation. We will ship IIS in-process hosting as part of the ASP.NET Core 2.2 release.

Why?

IIS in-process hosting is a brand new server implementation and hasn't received sufficient attention during the ASP.NET Core 2.1 release for us to feel comfortable shipping it at this time.

For discussion, use https://github.com/aspnet/IISIntegration/issues/878