Concurrent queue bind on the same queue results in crash

Description of problem:
While concurrently creating bindings to the same queue from multiple broker
connections, the broker will periodically crash.

How reproducible:
Frequently

Steps to Reproduce:
1. Concurrently create bindings to the same queue

Actual results:
Qpid broker will crash

Expected results:
Qpid broker does not crash and bindings are created