Use CNI 0.8.6 for Kubernetes 1.15+

[hakman]

Due to security advisory kubernetes/kubernetes#91507, k/k upgraded the CNI binaries to 0.8.6 for 1.16+. We still support 1.15, so we should do it for it also.
Refs:

• Update CNI to v0.8.6 kubernetes#91370
• Bundle CNI plugins (v0.8.6) in kubelet deb/rpm packages release#1309

[olemarkus]

/lgtm

[rifelpet]

hm, so existing k8s 1.15-1.17 clusters will be upgraded from 0.7.5 to 0.8.6 when they upgrade to the version of Kops that includes this? Are there any concerns with that upgrade process?

[hakman]

@rifelpet The idea was to migrate as much as possible to 0.8.6, probably including Kops 1.16.
I see that k/k set it as the default for 1.16+ so probably will not hurt 1.15 either.

If we merge it, we can see how the weekly e2e are behaving with older versions also.

[rifelpet]

ok, yes we can merge this and keep an eye on the 1.15 job before we release the next kops version that includes this 👍

https://testgrid.k8s.io/kops-versions#kops-aws-k8s-1.15

/approve

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