add workqueue and reflect metrics

[zjj2wry]

Although only the k8s.io/kubernetes/pkg/util/reflector/prometheus package was used, glide is still dumped into the entire k8s project. and i use glide get k8s.io/kubernetes/pkg/util/workqueue/prometheus --force command import package. Who has the idea to fix this problem?

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This change is 

[gaocegege]

We met the same problem during the development of v1alpha2. And we choose to copy the code from k8s into our code base.

I think maybe we should migrate from glide to dep and use dep prune to remove useless packages.

[coveralls]

Coverage remained the same at 54.357% when pulling 94d477b on zjj2wry:workqueque_metrics into eebc838 on kubeflow:master.

[zjj2wry]

I think switching to dep can solve our problem. I have already used it in my own project. I think it is a better package management tool. more detail in github.com/golang/dep.
@jlewi @wbuchwalter @gaocegege wdyt?

[gaocegege]

Yeah, I prefer dep, too. I opened an issue for it.#556

[gaocegege]

#557 is merged and I think you could use dep to reduce the vendor size.

[zjj2wry]

#557 is merged and I think you could use dep to reduce the vendor size.

I found that our current client-go dependency is a 1.8 cluster and we need to upgrade the dependency to 1.10？

[gaocegege]

@zjj2wry Is the clientgo 1.10 compatible with Kubernetes 1.8?

And why do we need to upgrade it 🤔

[zjj2wry]

Fixes #503

updated, @gaocegege @jlewi

[gaocegege]

/lgtm if you already run dep prune

[zjj2wry]

if you already run dep prune

yes, i already do it~

[gaocegege]

/lgtm

Thanks!

[gaocegege]

/approve

[k8s-ci-robot]

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