enable metrics server for scale tests

[upodroid]

The kubeup scale jobs used to run metrics-server, so we need to run it as well.

@serathius

[serathius]

But metrics server will not tolerate control-plain taint.

[upodroid]

I'll fix that in a separate PR today

[serathius]

Could we separate those efforts? No reason to mix metrics server with exec service.

[hakman]

/hold

[hakman]

@upodroid feel free to /unhold when ready.

[upodroid]

I have a better approach, metrics server pods needs to be deployed to tolerate control plane taints and bigger resource and I don't want to add that to kops. Instead, I implemented a kubetest1 flag called pre-test-cmd which behaves like the exec tester in kubetest2 so it should work much better. It also fixed up a few other kops jobs too

kubernetes-sigs/kubetest2#325

Once that's merged and shipped, we'll invoke a script that installs metrics-server to suit our use case and run any arbitrary commands before clusterloader2 starts

[hakman]

/approve cancel

[hakman]

/unapprove

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

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