PTR records are created and served for non-cluster IPs

```
apiVersion: v1
kind: Service
metadata:
name: manual-1
spec:
clusterIP: None
ports:
- port: 80
```

```
apiVersion: v1
kind: Endpoints
metadata:
name: manual-1
subsets:
- addresses:
- ip: 8.8.8.8
hostname: foo
ports:
- port: 80
```

Reverse lookups for 8.8.8.8 now return `foo.manual-1.default.svc.cluster.local.`

We should probably never create reverse records except for service IPs and real pod IPs.