Failing when there are multiple contexts in KUBECONFIG env variable.

[fmdlc]

Having multiple contexts in the environment variable KUBECONFIG fails when it tries to scan the provided namespace. The result is exactly the same passing the -n my_namespace flag or providing a specific context.

$ kubectl doctor 
WARN[0000] discovered a list of kubeconfigs & will respect current-context!  kubeconfiglist="[/Users/tty0/.kube/config /Users/tty0/.kube/config-dguiaf-prod /Users/tty0/.kube/config-dguiaf-rancher /Users/tty0/.kube/config-dguiaf-dev /Users/tty0/.kube/config-dguiaf-test /Users/tty0/.kube/k3s]"
INFO[0000] Going for a full scan as no flags are set!   
INFO[0000] Retrieving necessary clientset for targeted k8s cluster. 
INFO[0000]                                              
INFO[0000] Fetched namespaces: []                       
INFO[0000]                                              
error: namespace must be specified/retrieved properly!

$: kubectl get namespaces
NAME              STATUS   AGE
default           Active   9h
kube-node-lease   Active   9h
kube-public       Active   9h
kube-system       Active   9h
monitoring        Active   9h

$: echo $KUBECONFIG
/Users/tty0/.kube/config:/Users/tty0/.kube/config-prod:/Users/tty0/.kube/config-rancher:/Users/tty0/.kube/config-dev:/Users/tty0/.kube/config-test:/Users/tty0/.kube/k3s

$: kubectl version
Client Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.3", GitCommit:"1e11e4a2108024935ecfcb2912226cedeafd99df", GitTreeState:"clean", BuildDate:"2020-10-14T18:49:28Z", GoVersion:"go1.15.2", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.3+k3s1", GitCommit:"974ad30be7b7b15f695d88e46ffa96a4d43b2370", GitTreeState:"clean", BuildDate:"2020-10-16T00:18:50Z", GoVersion:"go1.15.2", Compiler:"gc", Platform:"linux/arm64"}