Commands broken because --show-all was removed from kubectl

[Troy Topnik]

The --show-all option has been removed in kubect v1.14 which means a number of kctl shortcuts no longer work:

k get configmap system:coredns
fetching configmap => 
failed to get resource configmap: exit status 1

but the actual command works:

kubectl get configmap -n kube-system coredns

The option was deprecated previously, then removed here:
kubernetes/kubernetes#69255

v0.0.11 of kctl seems to work OK with kubectl v1.14.