Because tls.Config now requires more fields to be set
in order for tls-alpn to work, Manager provides a new
TLSConfig method for easier setup.
This CL also adds a new internal package for end-to-end tests.
The package implements a simple ACME CA server.
Fixesgolang/go#25013Fixesgolang/go#25901
Updates golang/go#17251
Change-Id: I2687ea8d5c445ddafad5ea2cdd36cd4e7d10bc86
Reviewed-on: https://go-review.googlesource.com/125495
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
