Add cli option to specify the name of the loadbalancer used by the Kubernetes nat manager

[matkt]

PR description

Add cli option to specify the name of the loadbalancer used by the Kubernetes nat manager
--Xnat-kube-pod-name

We can specify the name of the load balancer

---
apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/name: besu
    app.kubernetes.io/release: "1.0.0"
  name: besu-custom-name
spec:
  ports:
  - name: "json-rpc"
    port: 8545
    targetPort: 8545
  - name: "rlpx"
    port: 30303
    targetPort: 30303
  selector:
    app.kubernetes.io/name: besu
    app.kubernetes.io/release: "1.0.0"
  type: LoadBalancer

And add the BESU_XNAT_KUBE_POD_NAMEon the deployment script of Besu to specify the name.

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: besu-config
  labels:
    app.kubernetes.io/name: besu
    app.kubernetes.io/release: 1.0.0
data:
  BESU_LOGGING: "DEBUG"
  ....
  BESU_XNAT_KUBE_POD_NAME: "besu-custom-name"
  KUBE_CONFIG_PATH: "/opt/besu/shared/kube-config"
---

Tested

• With Kubernetes (valid and invalid parameters)
• Without Kubernetes (valid and invalid parameters)

Fixed Issue(s)

[AbdelStark]

Main concern is about testing. Feel free to ignore comments not related to testing.

[AbdelStark]

Looks good to me.