Add webhook health check

[sbueringer]

/kind feature

Describe the solution you'd like
It would be nice if the controller health checks would use the readiness of the webhook server (instead of the no-op Ping).

For reference, the implementation in cluster-api: kubernetes-sigs/cluster-api#4989

Anything else you would like to add:
This requires at least controller-runtime v0.9.3.

Environment:

• Cluster-api-provider-vsphere version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[sbueringer]

There was an error found in the healthcheck. The fix PR is already merged in controller-runtime, but we should wait until the next controller-runtime version is released (0.9.6) with adding it to CAPV.

xref:

• Slack discussion: https://kubernetes.slack.com/archives/CD6U2V71N/p1627643594012600
• bugfix PR: 🐛 0.9: fix webhook health check tls handshake timeout errors controller-runtime#1616

[sbueringer]

fyi controller-runtime v0.9.6 has been released with a fix. So we should be good to go (I also verified it via the e2e tests of the cluster-api repo).

[srm09]

/close

[k8s-ci-robot]

@srm09: Closing this issue.

In response to this:

/close

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