golint: Use fork that respects vendor directory

golint: Use fork that respects vendor directory

Ideally, we would just use "golint ./..." to check all our our source
files for lint error. However, this does not work because it will
include all packages in the vendor directory. The pull request at:
	https://github.com/golang/lint/pull/325
fixes this issue, so we will use it until the PR has been merged.