Integration tests - running the tests

Initial setup for running the integration tests. A basic test is
included to ensure this works, although it will be rewritten to follow
the Page Object pattern. Thanks to Daniel Korn for the initial test.

https://wiki.openstack.org/wiki/Horizon/Testing/UI

Implements blueprint: selenium-integration-testing

Change-Id: Id5b62cdeac5295667a3922f7bed1db3c7617f841
Merge "Integration tests - running the tests"