Bugfix: deadlock when stopping follower #5014

Job	Run time
Lint check	1m 9s
Lint check	1m 9s
Format check	15s
Format check	15s
Compile LavinMQ	1m 3s
Compile LavinMQ	1m 3s
Spec FreeBSD	2m 36s
Spec FreeBSD	2m 36s
Lint javascript	14s
Lint javascript	14s
Lint OpenAPI	17s
Lint OpenAPI	17s
Filters for frontend specs	2s
Filters for frontend specs	2s
Spec	10m 1s
Spec	10m 0s
Spec OS X	2m 8s
Spec OS X	2m 8s
Bunny client test	2m 33s
Bunny client test	2m 33s
RabbitMQ HTTP API Ruby client test	50s
RabbitMQ HTTP API Ruby client test	50s
RabbitMQ java client test	5m 9s
RabbitMQ java client test	5m 9s
RabbitMQ HTTP API Go client test	1m 8s
RabbitMQ HTTP API Go client test	1m 8s
Test in release mode	16s
Test in release mode	16s
Frontend specs	0s
Frontend specs	0s
	55m 21s

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