Log consumer timeout with debug level #521

Job	Run time
Build new RabbitMQ	4m 12s
Build old RabbitMQ	4m 15s
Test durable_queue + 3 node(s)	1m 28s
Test 10k_queues_import + 1 node(s)	1m 18s
Test topic_bindings_import + 3 node(s)	5m 37s
Test transient_queue + 3 node(s)	1m 17s
Test durable_queue + 1 node(s)	57s
Test topic_bindings_import + 1 node(s)	2m 28s
Test 10k_queues_import + 3 node(s)	2m 33s
	24m 5s

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