Building swagger-ui

1. clone https://github.com/swagger-api/swagger-ui and checkout a stable tag
2. follow instructions for building swagger-ui
3. copy all files produced by the build from dist/ to ui/com/vmware/xenon/swagger/SwaggerDescriptorService
4. edit the index.html by adding this lines after "$(function () {"

 var url = window.location.search.match(/url=([^&]+)/);
 if (url && url.length > 1) {
   url = decodeURIComponent(url[1]);
 } else {
   var loc = window.location;
   url = loc.protocol + "//" + loc.host + "/discovery/swagger";
 }