Remove max days to keep limit in devicestatus delete.

Remove unused count query option in devicestatus delete api.

(cherry picked from commit 3101a8d7d054df469071f78bba18a8295dc34404)

lib/api/devicestatus/index.js

@@ -58,9 +58,6 @@ function configure (app, wares, ctx) {
     // delete record that match query
     api.delete('/devicestatus/', ctx.authorization.isPermitted('api:devicestatus:delete'), function(req, res) {
       var query = req.query;
-      if (!query.count) {
-        query.count = 10
-      }
 
       console.log('Delete records with query: ', query);