redis配置多个库，前缀会使用默认的前缀

Q	A
Bug report?	yes/no
Feature request?	yes/no
Swoft version	x.y.z
Swoole version	x.y.z (by `php --ri swoole`)
PHP version	x.y.z (by `php -v`)
Runtime environment	Win10/Mac/CentOS 7/Ubuntu/Docker etc.

Details

Describe what you are trying to achieve and what goes wrong.


# Redis
REDIS_NAME=redis
REDIS_DB=0
REDIS_URI=127.0.0.1:6379,127.0.0.1:6379
REDIS_MIN_ACTIVE=1
REDIS_MAX_ACTIVE=2
REDIS_MAX_WAIT=2
REDIS_MAX_WAIT_TIME=3
REDIS_MAX_IDLE_TIME=60
REDIS_TIMEOUT=3
REDIS_SERIALIZE=1
REDIS_PREFIX=oss_redis_

# upgrade redis node
REDIS_UPGRADE_REDIS_DB=2
REDIS_UPGRADE_REDIS_PREFIX=upgrade_center_

如果我使用REDIS_UPGRADE_REDIS_DB这个，结果发现redis的前缀会用默认的oss_redis_而不是upgrade_center_

swoft-cloud / swoft

redis配置多个库，前缀会使用默认的前缀 #256