Allow to use port name rather than port number for identifiers

[felipecrs]

Like:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: dynamic-hostport-example
spec:
  replicas: 5
  selector:
    matchLabels:
      app: dynamic-hostport-example-deployment
  template:
    metadata:
      annotations:
-       #dynamic-hostports.k8s/8080: 'DO NOT SET'
+       #dynamic-hostports.k8s/http: 'DO NOT SET'
      labels:
        app: dynamic-hostport-example-deployment
        # This is where the magic happens
-       dynamic-hostports: '8080' # Must be a string. Split multiple ports with '.'
+       dynamic-hostports: 'http' # Must be a string with port names or numbers. Split multiple ports with '.'
    spec:
      containers:
      - name: dynamic-hostport-example1-container
        image: paulbouwer/hello-kubernetes:1.8
        env:
          - name: MESSAGE
            value: Hello from port 8080
          #- name: PORT
          #  value: '8080' # 8080 Is standard port of paulbouwer/hello-kubernete
        ports:
        - containerPort: 8080
+         name: http
          #hostPort: DO NOT SET THIS HERE