Functional test for Kubernetes load balancer

The blueprint for the Kubernetes external load balancer calls for a functional test to ensure functionality.
In the current implementation, a manual step is required to enter the user credential in the Kubernetes configuration.
As a result, the functional test is blocked at this time.
A bug has been opened to remove this limitation in the Mitaka release:
https://bugs.launchpad.net/magnum/+bug/1505512

When this bug is resolved, the functional test can be added.

A suggestion for the functional test is to follow the nginx example in the document for the load balancer:
https://github.com/openstack/magnum/blob/master/doc/source/dev/dev-kubernetes-load-balancer.rst

The test would create a pod running nginx, then a service for this pod.
The service would indicate a load balancer is to be created.
Then the test would find the lb-vip created and query the endpoint for nginx.
The welcome message for nginx should be returned.