revision of client-go dependency in vendor needs bumped!

[yue9944882]

Do you want to request a feature or report a bug?

feature

What did you expect to see?

https://github.com/containous/traefik/blob/6a92ac0b7b04ea69a995f7635c0a7fb81fdfc952/Gopkg.toml#L189
I think it's sort of outdated. Any plan on upgrading this?

And kubernetes release-1.5 seems not maintained any more. Bumping this can activate more client-side utilities without breaking the compatibility. WDYT?

Branch	Canonical source code location	Maintenance status
client-go 1.4	Kubernetes main repo, 1.4 branch	= -
client-go 1.5	Kubernetes main repo, 1.5 branch	= -
client-go 2.0	Kubernetes main repo, 1.5 branch	= -
client-go 3.0	Kubernetes main repo, 1.6 branch	= -
client-go 4.0	Kubernetes main repo, 1.7 branch	✓
client-go 5.0	Kubernetes main repo, 1.8 branch	✓
client-go 6.0	Kubernetes main repo, 1.9 branch	✓
client-go HEAD	Kubernetes main repo, master branch	✓

[yue9944882]

@timoreimann

[timoreimann]

Updating client-go has definitely been on my list for quite a while. Apart from some improved functionality in the library itself, it might also help us reduce the amount of dependencies we have as upstream client-go has had a few unnecessary deps in the past.

glide used to be a blocker; with our transition to dep, however, updating should now be easier. Whoever does the change must be prepared though that a ton of packages have moved around, so it might not be that easy.

@yue9944882 if you want to take a stab, I'd be happy!

[yue9944882]

@timoreimann Of course I will have a try on that :-)