This code used to actually reach out to the internet to look for files. This
is flaky, slow, and semantically WRONG. The license that is upstream might
actually be different than what we have vendored. Only look at local files.
This now passes back-to-back updates and verifies.
godeps doesn't get everything we want, so fix the problem but write it
to a parallel tree since _workspace is reserved only for godeps auto-generated
files.
- Add Godeps/LICENSES.md
- Add verify-godep-licenses to verify that Godeps/LICENSES.md is up to date
- Trigger verify-godep-licenses in the pre-commit hook only if the Godeps dir has changed
- Exclude verify-godep-licenses in verify-all
- Add verify-godep-licenses to make verify (used by travis)
- Add verify-godep-licenses to shippable
- Update dev docs to mention update-godep-licenses
