Allow CNF Cert Suite app's go-clients to work in a k8s pod. #1543
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This change will allow the go-clients to be initialized properly in case the app is running inside a pod in a k8s/OCP cluster.
The method rest.InClusterConfig() reads the pod's SA tokens/creentials and returns a rest.Config struct that can be used to initialize all the go-clients.
If that method returns an error, it assumes it's running outside a cluster, using the provided filenames to create the rest.Config.