Bump Makefile to v0.30.0

Initial support for Kubernetes 1.12+

Add scripts to generate release notes.

Output the gofmt diff as well as the affected files.

Use "kubectl proxy" instead of a NodePort to expose the dashboard.

Remove refs to k8s_releases.json now that `get-k8s-versions` is gone.

NOTE: This differs against what 1.11 would do, but matches our current
Travis CI configuration.

It is otherwise difficult to debug issues when a contributors gofmt
version differs from the one Travis uses.

This allows us to always test against the latest stable release without
editing this file every 6 months.

It is otherwise difficult to debug issues when a contributors gofmt
version differs from the one Travis uses.

- Updates Ingress-Controller Version to 0.19.0
- Adds Service Account for Ingress-Controller
- Adds Support for Prometheus
- Fixes bug with TCP/UDP ConfigMaps not Loading
- Adds more resource limits to default-backend
- Use new ingress class name
- Use app.kubernetes.io/xxxxxxxxxxx labels

Upgrade cni and cni-plugins to release version

ensure that /dev has settled before operating

This is necessary now that there is no proper service endpoint to block
on.