Switch on/off passthrough feature

[kirill-levitskiy]

Every high-loaded project brings us a problem with passthrough. The problem affects rabbitmq and overflows message queues by message count or by size.
The passthrough feature is not required sometimes, that's why will be great to switch off it in favor of performance.
This feature is highly important from prospective of development new sailor_v3: https://github.com/elasticio/sailor-nodejs/tree/v3 and could be implemented there.