Socket flush fiber #4706

Job	Run time
Spec FreeBSD	2m 26s
Compile LavinMQ	1m 9s
Format check	19s
Lint check	1m 8s
Lint javascript	17s
Lint OpenAPI	17s
Filters for frontend specs	5s
Spec	10m 2s
Spec OS X	10m 15s
Test in release mode	17s
RabbitMQ java client test	6h 0m 13s
Bunny client test	1h 9m 42s
RabbitMQ HTTP API Go client test	10m 42s
RabbitMQ HTTP API Ruby client test	1h 59m 42s
Frontend specs	0s
	9h 46m 34s

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