added close method to YclientsDal

dal/dal.go

@@ -362,3 +362,11 @@ func NewYclientsDal(ctx context.Context, cred string) (*YclientsDal, error) {
 		AnswerRepo:   answerRepo,
 	}, nil
 }
+
+func (d *YclientsDal) Close(ctx context.Context) error {
+	err := d.conn.Close()
+	if err != nil {
+		return err
+	}
+	return nil
+}