Message deduplication #4939

Job	Run time
Format check	15s
Lint check	1m 5s
Lint javascript	14s
Lint OpenAPI	17s
Spec FreeBSD	2m 26s
Compile LavinMQ	59s
Filters for frontend specs	3s
Spec	2m 6s
Spec OS X	2m 26s
Test in release mode	21s
RabbitMQ java client test	5m 3s
RabbitMQ HTTP API Go client test	57s
Bunny client test	2m 31s
RabbitMQ HTTP API Ruby client test	57s
Frontend specs	2m 18s
	21m 58s

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