Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Godep scripts cleanup

Another try at sanitizing godep scripts.  Instead of messing with containers, or assuming anything about GOPATHs, let's just work with whatever GOPATH we are given.  If you want sane godep/restore behavior you can use `./hack/run-in-gopath.sh ./hack/godep-restore.sh`.  This will restore into your _output dir.  You can update deps yourself, and then run `./hack/run-in-gopath.sh ./hack/godep-save.sh`.

xref  #44873

This also checks out godep into your working GOPATH.  Without this, we have to `go get` it every time.  We should just vendor it.