eclass: update go eclasses from upstream

This adds go-module.eclass and updates the other go eclasses.

Taken from upstream commit 48f026861983fbd3001c7515f87828b13c581e7a

BUG=chromium:1029133
TEST=none

Change-Id: I636bdd64f2a3b26fc2f3ecd4180092f2126a99fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/1940900
Tested-by: Tom Hughes <tomhughes@chromium.org>
Auto-Submit: Tom Hughes <tomhughes@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
5 files changed