Add boostrap JS to test index page

The method get_credentials needs modal.

issue8315
review287361002

tests/index.html

@@ -5,6 +5,7 @@ this repository contains the full copyright notices and license terms. -->
     <head>
         <title>Sao Test Suite</title>
         <script type="text/javascript" src="../bower_components/jquery/dist/jquery.min.js"></script>
+        <script type="text/javascript" src="../bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
         <script type="text/javascript" src="../bower_components/moment/min/moment.min.js"></script>
         <script type="text/javascript" src="../bower_components/gettext.js/dist/gettext.js"></script>
         <script type="text/javascript" src="../bower_components/qunit/qunit/qunit.js"></script>