* Cleanup mentions about glide
* Don't use glide to ignore vendor directory
Since go-1.9, "./..." no longer contains the "vendor" directory.
Also, since #1305 migrated dependency management from glide to go mod,
there is no need to think about the "vendor" directory.
See: https://golang.org/doc/go1.9#vendor-dotdotdot
* go mod tidy
Owners file currently isn't being used (unless we have the Kubernetes
bot in-use), however, it needed a well-overdue update.
I've gone ahead and updated the CONTRIBUTING.md doc to add the change
that it requires *two* reviews for a code-review and one for a doc
review.
