cmd/dist: put cgo tests under a "Testing cgo" heading
Currently the cgo tests mostly use their package name as a heading,
which means we get a large number of test sections that each have a
single test package in them.
Unify them all under "Testing cgo" to reduce output noise.
This leaves just the cmd/api test without a heading, so we give it a
heading and require that all tests have a heading.
Change-Id: I24cd9a96eb35bbc3ff9335ca8a382ec2426306c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/494497
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>