extend CRD to allow location aware setups

I suggest adding --location argument, and pass it the k8s node name, to prevent suboptimal distribution of replicas inside a cluster

e.g.:

```yaml
...
- args:
- start
- ...
- --location=k8s-node=${NODE_NAME},property=value,...
- env:
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
```