Allow specifying generated kubeconfig file

[tennix]

This PR fixes #142. When failed to load kubeconfig, fallback to use rest.Config{}.

[jhoblitt]

What is the result of this change? Would KUBECONFIG from the env be used even when the value of load_config_file = true and config_path = "/dev/null"?

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[aareet]

I'm closing this now since this is attempting to solve an upstream issue - #142 (comment).

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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