QQ AZ awareness #2079

Job	Run time
Build new RabbitMQ	3m 56s
Build old RabbitMQ	4m 11s
Test transient_queue + 3 node(s)	1m 1s
Test durable_queue + 1 node(s)	41s
Test topic_bindings_import + 3 node(s)	2m 23s
Test durable_queue + 3 node(s)	1m 3s
Test 10k_queues_import + 1 node(s)	1m 51s
Test 10k_queues_import + 3 node(s)	2m 17s
Test topic_bindings_import + 1 node(s)	1m 1s
	18m 24s

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