Add "ports" parameters in Kubernetes context

Add "ports" parameters in Kubernetes context

This new parameter, "ports", will allow the user to
automatically to add port variables in a pod definition:
context:
  type: Kubernetes
    servers:
        host:
            image: ...
            commands: ...
            ports:
                - containerPort: <port value>    # Mandatory
                  hostIP: <host IP>              # Optional
                  hostPort: <host port>          # Optional
                  name: <port name>              # Optional
                  protocol: <protocol name>      # Optional

The port type and the definition must be one of the supported ones
in Kubernetes [1].

Container port definition, V1 API, Kubernetes Python library v6.0.0 [2]

[1] https://kubernetes.io/docs/concepts/services-networking/connect-applications-service/
[2] https://github.com/kubernetes-client/python/blob/6.0.0/kubernetes/client/models/v1_container_port.py

JIRA: YARDSTICK-1183

Change-Id: I3673dbeec8d380cb2f8b1dacf6c25c7cdbc37e28
Signed-off-by: John O Loughlin <john.oloughlin@intel.com>