Provide example how to use dep override for glog proxy

[dmage]

/kind feature

I tried to add to my Godep.toml next lines

[[override]]
    name = "github.com/golang/glog"
    source = "k8s.io/klog/glog"

but apparently dep ignored the /glog suffix and copied entire klog into vendor/github.com/golang/glog. And it looks dep's authors don't want to have subdirs.

As dep is mentioned in the README file, I expect there should be a way to do it, though.

[dims]

@dmage as you said, it does not work, so removing it in #36