full clone cacert from config object

[tg123]

fix #1436

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[brendandburns]

/lgtm
/approve

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[PSanetra]

@brendandburns @tg123 As far as I see there is still an issue with this implementation. The certificates are now copied from the KubernetesClientConfiguration instance to each consuming KubernetesClient instance. Each KubernetesClient instance will dispose their copied X509Certificate2 instances on their Dispose() call, but the config.SslCaCerts will get never disposed as KubernetesClientConfiguration does not implement IDisposable.