Bump client-go to version 1.11
Bump client-go to version 1.11

This required:
* Bumping all the kubernetes dependenices to 1.14
* Replacing justinbarrick/go-k8s-portforward by 2opremio/go-k8s-portforward
  until https://github.com/justinbarrick/go-k8s-portforward/pull/6 is merged

weaveworks/flux,weaveworks/flux