metrics: Expose iperf3 pods over a k8s networks.

A prerequisite for measuring kata network bandwidth is
run Iperf3 tool at a the transport layer provided by a
k8s service for exposing a network where the clients
inside the cluster can use to contact Pods in the service.

Signed-off-by: David Esparza <david.esparza.borquez@intel.com>

tests/metrics/network/iperf3_kubernetes/runtimeclass_workloads/iperf3-deployment.yaml

@@ -42,3 +42,17 @@ spec:
           name: server
       terminationGracePeriodSeconds: 0
       runtimeClassName: kata
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: iperf3-server
+spec:
+  selector:
+    app: iperf3-server
+  ports:
+  - protocol: TCP
+    port: 5201
+    targetPort: server