cmd/go: prepare tests for GO111MODULE=on by default

Set GO111MODULE=off explicitly in tests specific to GOPATH mode.

Added a go.mod file to other tests that assumed GOPATH mode.

Fixed an issue in the build metadata file generated in
modload/build.go, which did not end with a newline. This broke the
build_dash_x test, which expects to be able to run the script printed
by 'go build -x' to produce the same result. The script is broken if
the build metadata file doesn't end with a newline.

Change-Id: I59f2a492a9f5a66f6c4aa702f429909d5c5e815d
Reviewed-on: https://go-review.googlesource.com/c/go/+/255051
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
106 files changed
tree: 2c006f546ad8c1d956b3be67d63d3884e3014259
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
README.md

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