support set custom redis queue name

[leason00]

support set custom redis queue name

[yoonsio]

Thanks for your PR. I think it might be better to expose this by using public variable instead.

[yoonsio]

this will break lint

[leason00]

Thanks for your review.
Do you mean like this？
`// RedisCeleryBroker is celery broker for redis
type RedisCeleryBroker struct {
*redis.Pool
QueueName string
}

// NewRedisBroker creates new RedisCeleryBroker with given redis connection pool
func NewRedisBroker(conn *redis.Pool, queueName string) *RedisCeleryBroker {
return &RedisCeleryBroker{
Pool: conn,
QueueName: queueName,
}
}`

[leason00]

this will break lint

[yoonsio]

yes

[yoonsio]

Sorry but I have to close this PR request. I think this should be applied to all brokers/backends.
I already merged the changes into the master: #144
This should solve your problem.