Implement AMQP sole conn spec #2081

Job	Run time
Build new RabbitMQ	4m 7s
Build old RabbitMQ	4m 10s
Test 10k_queues_import + 1 node(s)	1m 18s
Test 10k_queues_import + 3 node(s)	3m 1s
Test topic_bindings_import + 3 node(s)	1m 40s
Test transient_queue + 3 node(s)	1m 45s
Test durable_queue + 3 node(s)	1m 28s
Test topic_bindings_import + 1 node(s)	50s
Test durable_queue + 1 node(s)	41s
	19m 0s

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