add support Lease-based leader election (rather than ConfigMaps)

[thesuperzapper]

What is the feature and why do you need it:

Currently, the K8S Python API only supports leader election using ConfigMapLock.

The K8S Go API supports using the proper Lease resource type with its LeaseLock, and actually recently removed support for the legacy ConfigMap approach.

We should update the Kubernetes Python API to provide a Lease-based leader election.

---

/cc @Invictus17 @tdihp

[roycaihw]

/help

[k8s-ci-robot]

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[Jagrutiti]

Hi,

I am beginner to Kuberenetes repo. Do you think this is a good issue to pick?

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/lifecycle stale

[thesuperzapper]

/remove-lifecycle stale

[edas-smith]

+1 for this - Would be great to have this

[lwille]

Adding my +1 to prevent this from becoming stale.

[rvlane]

Came across this researching providing HA on an operator based solution and wanted to have this Lease-base lock implemented. Got a fork setup through my company and plan to contribute this back to the project. Just need to know the process for contributing this back. Thanks

[Invictus17]

@rvlane you can send a PR similar to https://github.com/kubernetes-client/python/pull/1747/commits. Hope that helps. I can review it.

cc: @roycaihw

[rvlane]

@Invictus17 Thanks. Starting work on this now.