service: config load only on start, not init phase

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

util/stream/stream.go

@@ -20,10 +20,10 @@ type Stream interface {
 }
 
 type stream struct {
+	sync.RWMutex
 	Stream
 	err     error
 	request *request
-	sync.RWMutex
 }
 
 type request struct {