Add cache-buster to hit database always

test/acceptance/user-database-timeout-limit.js

@@ -24,11 +24,23 @@ const validationPointSleepSql = `
         2 val
 `;
 
+const cartoCSSPoints = () => `
+// cache buster: ${Date.now()}
+#layer{
+  marker-placement: point;
+  marker-allow-overlap: true;
+  marker-line-opacity: 0.2;
+  marker-line-width: 0.5;
+  marker-opacity: 1;
+  marker-width: 5;
+  marker-fill: red;
+}`;
+
 const createMapConfig = ({
     version = '1.6.0',
     type = 'cartodb',
     sql = pointSleepSql,
-    cartocss = TestClient.CARTOCSS.POINTS,
+    cartocss = cartoCSSPoints(),
     cartocss_version = '2.3.0',
     interactivity = 'cartodb_id',
     countBy = 'cartodb_id',