Update the description for grey icons on status pg

When viewing the status page it makes sense that items with
dependencies appear as children to those changes. As such hopefully
make the grey dot description clearer that a change is only there
to be tested by the child.

Change-Id: Iadf9dee64dd143c9b6f0c4cf8786d3188a4df1d2
diff --git a/etc/status/public_html/jquery.zuul.js b/etc/status/public_html/jquery.zuul.js
index 5e44205..40a5d4d 100644
--- a/etc/status/public_html/jquery.zuul.js
+++ b/etc/status/public_html/jquery.zuul.js
@@ -375,7 +375,7 @@
                 else if (change.live !== true) {
                     // Grey icon
                     icon_name = 'grey.png';
-                    icon_title = 'Dependent change independently tested';
+                    icon_title = 'Dependent change required for testing';
                 }
                 else if (change.failing_reasons &&
                          change.failing_reasons.length > 0) {