Encode AMQP 1.0 arrays of zero-octet elements as opaque values #2054

Job	Run time
Build new RabbitMQ	4m 8s
Build old RabbitMQ	4m 27s
Test 10k_queues_import + 3 node(s)	2m 29s
Test durable_queue + 3 node(s)	1m 5s
Test transient_queue + 3 node(s)	1m 20s
Test topic_bindings_import + 1 node(s)	46s
Test 10k_queues_import + 1 node(s)	1m 27s
Test durable_queue + 1 node(s)	44s
Test topic_bindings_import + 3 node(s)	1m 41s
	18m 7s

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