fake_rabbit shouldn't use prefix matching on routing keys

[justinsb]

fake_rabbit is currently parsing the routing_keys, as if we were doing prefix matching. I had a bug with a message being received multiple times because of this (I'm working on some complicated unit tests) We're just using straight routing_key literal matching, so fake_rabbit shouldn't be doing this.

[justinsb (justin-fathomdb)]

This fix then broke test_associate_disassociate_address. There's another bug there - it was building a queue name of "network.None", because queue_get_for in sqlalchemy/api.py was blindly appending the 'None' to the queue name. Updated fix on its way!