Node port service test always expect that port is part of cluster URL

[deebhatia]

create_check_and_delete_pod_with_node_port_service gets erred when cluster URL doesn't have a port. Code expects the URL to always contain port. See here. For example, URL of type https://k8s-api.example.com gives the service URL as http:30151/ instead of https://k8s-api.example.com:30151/.

MissingSchema: Invalid URL 'http:30151/': No schema supplied. Perhaps you meant http://http:30151/?

Traceback (most recent call last):
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/rally/task/runner.py", line 71, in _run_scenario_once
    getattr(scenario_inst, method_name)(**scenario_kwargs)
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/rally_plugins/scenarios/kubernetes/services.py", line 229, in run
    requests.get(url, **kwargs)
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/requests/sessions.py", line 519, in request
    prep = self.prepare_request(req)
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/requests/sessions.py", line 462, in prepare_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/requests/models.py", line 313, in prepare
    self.prepare_url(url, params)
  File "/opt/rally/xrally-venv/local/lib/python2.7/site-packages/requests/models.py", line 387, in prepare_url
    raise MissingSchema(error)
MissingSchema: Invalid URL 'http:30151/': No schema supplied. Perhaps you meant http://http:30151/?