Hard exit when loosing leadership #4792

Job	Run time
Lint check	1m 5s
Format check	13s
Lint javascript	16s
Lint OpenAPI	24s
Spec	1m 48s
Compile LavinMQ	59s
Spec FreeBSD	2m 24s
Filters for frontend specs	38s
Spec OS X	2m 54s
RabbitMQ HTTP API Ruby client test	51s
RabbitMQ java client test	5m 6s
Bunny client test	2m 37s
RabbitMQ HTTP API Go client test	1m 0s
Test in release mode	17s
Frontend specs	0s
	20m 32s

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