- Use submodules for vendoring.
- Don't go clean, now that everything is in .pkg.
- sudo -E as we need the environment variables.
- Install -race version of std so the tests can run without sudo.
- Cache the build image on circle, use the rebuild-image script from tools.
- Use git submodule for tools.
- Update Makefile to use submodules.
- Put submodule at tools/
- Tidy up some obsolete references to tools in .gitignore.