feature request: annotation to disable namespaced hostname

I like the annotations that allow some control over mdns names:

```yaml
[..]
    external-mdns.blakecovarrubias.com/hostnames: foo
    external-mdns.blakecovarrubias.com/without-namespace: "true"
[..]
```

Is is also possible to disable the creation of `foo-foospace.local `?