Message deduplication #4732

Job	Run time
Format check	11s
Compile LavinMQ	58s
Spec FreeBSD	2m 13s
Lint check	59s
Lint javascript	15s
Lint OpenAPI	15s
Filters for frontend specs	2s
Spec	1m 58s
Spec OS X	1m 50s
RabbitMQ java client test	5m 8s
Bunny client test	2m 32s
RabbitMQ HTTP API Ruby client test	48s
RabbitMQ HTTP API Go client test	1m 3s
Test in release mode	15s
Frontend specs	3m 11s
	21m 38s

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