DefaultClientConfig creates a clientcmd.ClientConfig with the following hierarchy: 1.

Assumes the flag has a default value.

NewFactory creates a factory with the default Kubernetes resources defined if optionalClientConfig is nil, then flags will be bound to a new clientcmd.ClientConfig.

OutputVersion returns the preferred output version for generic content (JSON, YAML, or templates).

PrinterForCommand returns the default printer for this command.

ReadConfigData reads the bytes from the specified filesytem or network location or from stdin if location == "-".

TODO: replace with resource.Builder.

Factory provides abstractions that allow the Kubectl command to be extended across multiple types of resources and different API sets.