Add initialize to amqp connection_factory #4982

Job	Run time
Format check	11s
Compile LavinMQ	59s
Lint check	1m 1s
Spec FreeBSD	4m 37s
Lint javascript	18s
Lint OpenAPI	18s
Filters for frontend specs	2s
Spec	2m 0s
Spec OS X	2m 44s
Bunny client test	2m 52s
Test in release mode	17s
RabbitMQ HTTP API Go client test	1m 12s
RabbitMQ java client test	5m 40s
RabbitMQ HTTP API Ruby client test	57s
Frontend specs	0s
	23m 8s

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