change exit to error when the vkey is not right

client/client.go

@@ -47,7 +47,7 @@ func (s *TRPClient) Start() {
 retry:
 	c, err := NewConn(s.bridgeConnType, s.vKey, s.svrAddr, common.WORK_MAIN, s.proxyUrl)
 	if err != nil {
-		logs.Error("The connection server failed and will be reconnected in five seconds")
+		logs.Error("The connection server failed and will be reconnected in five seconds, error", err.Error())
 		time.Sleep(time.Second * 5)
 		goto retry
 	}

client/control.go

@@ -241,8 +241,7 @@ func NewConn(tp string, vkey string, server string, connType string, proxyUrl st
 	if s, err := c.ReadFlag(); err != nil {
 		return nil, err
 	} else if s == common.VERIFY_EER {
-		logs.Error("Validation key %s incorrect", vkey)
-		os.Exit(0)
+		return nil, errors.New(fmt.Sprintf("Validation key %s incorrect", vkey))
 	}
 	if _, err := c.Write([]byte(connType)); err != nil {
 		return nil, err