Ref counting MFiles #4862

Job	Run time
Format check	12s
Lint check	1m 0s
Lint OpenAPI	18s
Lint javascript	17s
Spec OS X	2m 2s
Spec FreeBSD	2m 29s
Compile LavinMQ	58s
Filters for frontend specs	2s
Spec	1m 58s
RabbitMQ HTTP API Ruby client test	50s
Test in release mode	16s
RabbitMQ java client test	5m 8s
Bunny client test	2m 28s
RabbitMQ HTTP API Go client test	1m 0s
Frontend specs	0s
	18m 58s

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