TKGi is degraded and it's not possible to run kubectl commands against a cluster externally
Use the smoke-tests kubeconfig on the master node for kubectl commands:
bosh -d service-instance_<guid> ssh master/0
kubectl="/var/vcap/packages/kubernetes/bin/"
export PATH=${kubectl}:$PATH
export KUBECONFIG="/var/vcap/jobs/smoke-tests/config/kubeconfig"
alias k=kubectl