feat: add api for system clock update

zhangzengfei

2019-10-21 e871758bd82d9a4fbce42e43c9665d869c240dfb

 extend/code/code.go

@@ -60,4 +60,5 @@

   ComError = &Code{http.StatusInternalServerError, false, ""}
   ClusterNodesEmpty = &Code{http.StatusOK, true, "集群节点为空"}
   AddTaskErr = &Code{http.StatusInternalServerError, false, "此国标摄像机已在其它服务器配置任务！"}
)