Bug 1104299 - Authenticate via PulseGuardian +autoland

https://bugzilla.mozilla.org/show_bug.cgi?id=1104299
Hmm, this is more of a dummy exchange though, just to publish messages to the queue. Without it, it tries to use the default exchange which we don't have permissions for. It actually isn't utilized in the worker, so to me I feel like it shouldn't be there. I'm happy to move it if that's the better design though.