[BUG] k8s service's Target port and Port being different causes wrong port to be picked up

[aattuluri]

Describe the bug
If a k8s service's target port is different from the port field then the right port is not picked up

Steps To Reproduce
Having the following objects will help reproduce the error:

k8s service:

apiVersion: v1
kind: Service
metadata:
  labels:
    app: greeting
    identity: greeting
  name: greeting
spec:
  ports:
    - port: 80
      targetPort: 8080
      name: http
  selector:
    app: greeting

k8s Deployment:

...
  spec:
      template:
         annotations:
              traffic.sidecar.istio.io/includeInboundPorts: "8080"
...

The above configuration doesn't result in a port match causing invalid service entry to be generated.

Expected behavior
A clear and concise description of what you expected to happen.

[aattuluri]

Fixed with #165