Add an apply_open_security_group integration test to CI.

We had a bug in the apply_open_security_group functionality that would have been easily caught by simply turning that flag on for one of the app-brokers in our test tile. See #309 for the bug.

We have created an issue in Pivotal Tracker to manage this. Unfortunately, the Pivotal Tracker project is private so you may be unable to view the contents of the story.

The labels on this github issue will be updated when the story is started.