Clustering: log how many files are sent on full sync #4686

Job	Run time
Lint check	1m 3s
Format check	16s
Lint javascript	17s
Lint OpenAPI	22s
Compile LavinMQ	1m 6s
Spec FreeBSD	2m 36s
Spec	2m 25s
Filters for frontend specs	3s
Spec OS X	2m 8s
RabbitMQ java client test	5m 0s
Bunny client test	2m 31s
RabbitMQ HTTP API Go client test	1m 3s
Test in release mode	16s
RabbitMQ HTTP API Ruby client test	49s
Frontend specs	0s
	19m 55s

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