add deliver_get to message stats #4350

Job	Run time
Format check	19s
Lint check	1m 3s
Compile LavinMQ	1m 2s
Spec FreeBSD	2m 24s
Lint javascript	15s
Lint OpenAPI	19s
Filters for frontend specs	3s
Spec	2m 17s
Spec OS X	3m 24s
RabbitMQ HTTP API Go client test	57s
Test in release mode	19s
Bunny client test	2m 51s
RabbitMQ java client test	4m 18s
RabbitMQ HTTP API Ruby client test	53s
Frontend specs	0s
	20m 24s

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