cmd/dist: let the three runtime -quick tests run simultaneously
For #65164
Change-Id: Ied19cebd113ef91c34f613cafbeb92a335d6420d
GitHub-Last-Rev:
8118be6e30ffc4edcd88b8a1d5ee3105e2c760de
GitHub-Pull-Request: golang/go#65444
Reviewed-on: https://go-review.googlesource.com/c/go/+/560597
Commit-Queue: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>