start using `app.kubernetes.io/` labels

[jcpunk]

trafficstars

The app.kubernetes.io/ labels are becoming part of the standard way of labeling things within the infrastructure. Can this be updated to start applying those labels to various elements?

[gman0]

This will be hard to change (i.e. upgrade) without requiring a complete re-install of the driver. In many places, labels (and especially selectors in ReplicaSets) are read-only after deployment.