🐛 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

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In response to this:

/cherry-pick release-0.16

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