clientv3/namespace/kv.go
func NewKV(kv clientv3.KV, prefix string) clientv3.KV {
	return &kvPrefix{kv, prefix}
}
func NewKV(kv clientv3.KV, prefix string) clientv3.KV {
	return &kvPrefix{kv, prefix}
}
func NewKV ( kv clientv3 . KV , prefix string ) clientv3 . KV { return & kvPrefix { kv , prefix } }
// NewKV wraps a KV instance so that all requests
// are prefixed with a given string.
NewKV wraps a KV instance so that all requests are prefixed with a given string .