Log number of messages loaded #4669

Job	Run time
Lint check	1m 4s
Lint javascript	20s
Format check	18s
Compile LavinMQ	1m 11s
Spec FreeBSD	2m 25s
Lint OpenAPI	22s
Spec	2m 11s
Filters for frontend specs	5s
Spec OS X	3m 18s
RabbitMQ HTTP API Ruby client test	48s
RabbitMQ java client test	5m 9s
RabbitMQ HTTP API Go client test	1m 5s
Test in release mode	18s
Frontend specs	0s
Bunny client test	2m 36s
	21m 10s

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