Log consumer timeout with debug level (backport #15820) #522

Job	Run time
Build old RabbitMQ	4m 19s
Build new RabbitMQ	3m 53s
Test 10k_queues_import + 1 node(s)	1m 32s
Test transient_queue + 3 node(s)	1m 12s
Test topic_bindings_import + 3 node(s)	7m 33s
Test 10k_queues_import + 3 node(s)	2m 35s
Test durable_queue + 1 node(s)	1m 2s
Test durable_queue + 3 node(s)	1m 38s
Test topic_bindings_import + 1 node(s)	2m 33s
	26m 17s

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