plc地址和工艺参数不再单独拉取，只serf主启动时拉取

zhangqian

2023-10-13 f838162ed0ee7f2832924c2399eddd461760135a

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package constvar
 
import (
    "github.com/songzhibin97/gkit/cache/local_cache"
    "golang.org/x/sync/singleflight"
)
 
var (
    BlackCache  local_cache.Cache
    SingleGroup = &singleflight.Group{}
)