exec, log, proxy kubectl subcommands don't work as expected; probably others. should review kubectl

• executor upgrade after config change
• maybe scheduling onto a public slave, depending on the progress with the roles patch

@karlkfi anything you'd like to see listed here as a result of the kubecon dogfooding?

Scaling is borked due to pod scheduling, but maybe that's more of a bug

xref #624

The following section is on [[https://docs.mesosphere.com/services/kubernetes/#subcommand]] but should instead be on [[https://github.com/kubernetes/kubernetes/blob/master/contrib/mesos/docs/issues.md]]. Then the dcos docs can just link to the known issues.

Known Issues
In this release the following kubectl commands are not supported:
- exec
- logs
- port-forward
- proxy
- version

don't support pod updates

port mapping label key k8s.mesosphere.io/portMapping affects port allocation (and we should deprecate this as a label, convert it to an annotation)

testing slack integration

address review feedback, awaiting lgtm