[bjencks]

Add a new built-in problem daemon plugin (apiserver-monitor) that checks connectivity to the Kubernetes API server.

It specifically creates a new client on every poll in order to test the full stack from TCP connection up.

This required moving kube_rest.Config creation from problemclient into pkg/util (util.NewKubeClientConfig) and initializing util.GlobalKubeClientConfig in npdMain for both problemclient and apiserver-monitor to consume.

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bjencks
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[kubernetes-prow]

Hi @bjencks. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[wangzhen127]

/ok-to-test