compatible with grafana5.4.3 (#690)
compatible with grafana5.4.3 (#690)

修复对接grafana5.4.3配置数据源出错的bug (#690)
taomaree/falcon-plus,open-falcon/falcon-plus,open-falcon/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus,open-falcon/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus