Load system certificates by default instead of Mozilla root certs

[Smana]

Hi everyone!

We have our own pki and the ca certificate is loaded into the system.
However, using the kubernetes python doesn't support loading system certs.

I checked the urllib changes and it is supposed to work (urllib3/urllib3#1608)

* Change ``HTTPSConnection`` to load system CA certificates
  when ``ca_certs``, ``ca_cert_dir``, and ``ssl_context`` are
  unspecified. (Pull #1608, Issue #1603)

Currently the default behaviour of the kubernetes python librairy is to use Mozilla's root certificates (https://github.com/kubernetes-client/python/blob/master/kubernetes/client/rest.py#L70)

Is there a reason for that ?

Environment:

• Kubernetes version: 1.15.9
• OS (e.g., MacOS 10.13.6): Ubuntu bionic
• Python version: 3.7.9
• Python client version: 7.0.0

[palnabarun]

This issue is similar to #1131

[roycaihw]

cc @palnabarun

This file is generated by openapi-generator. Should this be an upstream generator issue?

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