🐛 Use http client from leaderElectionConfig

[troy0820]

During creation of the manager, the default cluster.HTTPClient is being used during leader election causing cert issues and not responding to events because of the conflict of the kubeconfig it uses for the manager. It never uses the kubeconfig from the leaderElectionConfig when being set.

This PR sets that value and creates a httpClient from the restConfig passed in on the options.LeaderElectionConfig

• Use the http client from the leaderElectionConfig from options in manager

Resolves #2454

[k8s-ci-robot]

Hi @troy0820. Thanks for your PR.

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[alvaroaleman]

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, troy0820

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[troy0820]

/ok-to-test

[sbueringer]

/cherry-pick release-0.16

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #2468

In response to this:

/cherry-pick release-0.16

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.