ASM destroy failing

[bharathkkb]

#918 introduced cleaning up labels on ns but for some reason it seems to run after exit. This results in the generated kubeconfig being destroyed and kubectl label namespaces --all istio-injection- unable to talk to the api server.

 Fetching cluster endpoint and auth data.
       kubeconfig entry generated for simple-zonal-asm-cluster-pcir.
       + kubectl delete ns asm-system istio-system
       namespace "asm-system" deleted
       namespace "istio-system" deleted
       + cleanup
       + rm -rf /tmp/kubectl_wrapper_22071_18334
       The connection to the server localhost:8080 was refused - did you specify the right host or port?