pick proxy from kube_config

[kwibus]

What type of PR is this?

/kind feature

What this PR does / why we need it:

kubeconfig support the option proxy-url . This is option is ignored by this client. and people have trouble to configer there proxy #1967 This pull request will use that option to set kubernetes.client.load_kube_config()' to set kubernetes.client.configuration.proxy`

Which issue(s) this PR fixes:

Fixes #2183

Special notes for your reviewer:

Does this PR introduce a user-facing change?

`load_kube_config`, ` new_client_from_config_dict`, `new_client_from_config` will use `proxy-url` cluster setting to `set client..configuration.proxy`.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: kwibus / name: Rens (376f179ea114c6299055a9c68836a419e5de3d0d, f27bb49bf10bb77af2784d9d81efebdf72cfd143)

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[roycaihw]

/assign

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/lifecycle stale

[MadJlzz]

@roycaihw any chance we could look at this? I can lend a hand for testing it!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fabianvf, kwibus Once this PR has been reviewed and has the lgtm label, please ask for approval from roycaihw. For more information see the Kubernetes Code Review Process.

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[fabianvf]

/lgtm

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close

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