Rename labels to app as opposed to appName

[eed3si9n]

steps

Generate YAML.

problem

  labels:
    appName: "bootstrap-dns-demo"

expectation

Akka Management documentation (https://developer.lightbend.com/docs/akka-management/current/bootstrap/kubernetes-api.html) uses app as the label name. We should be consistent.

  labels:
    app: "bootstrap-dns-demo"

This is subtle enough to miss, and could take hours to debug.

[eed3si9n]

Or akka.lightbend.com/service-name.

[TimMoore]

Relates to akka/akka-management#411

[TimMoore]

@eed3si9n is this in scope for 1.7.0?

[eed3si9n]

@TimMoore I guess it depends on the consensus around the label name.
If we can agree on something this feels like a low hanging fruit.