support config to use RequeueWithoutBackoff

[penghuazhou]

If the consumer occasionally times out when calling an external interface, the timeout request needs to be retried, and so consumer returns err. In this scenario, a backoff will be triggered, causing consumers to pause their consumption for several seconds. But it is more reasonable not to pause consumption in this scenario.

go-nsq/consumer.go

Line 1153 in 796abbc

message.Requeue(-1)

modify like this