Packages referenced by tool lines in go.mod files will now be included
in the module graph for the new "tool" package pattern and the "all"
package pattern.
For golang/go#48429
Change-Id: I128f6a50880814bd5395674426c9a7ee2ddc19bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/521959 Reviewed-by: Carlos Amedee <carlos@golang.org> Reviewed-by: Michael Matloob <matloob@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>