Added TestId if test is run with specs

If Test is run with --specs then WPT was not returning any testid so we can create a result url and show it to user. This change will help the caller get the testId and so create a link to Test Result

Author: SunnyGurnani

lib/webpagetest.js

@@ -362,6 +362,9 @@ function runTest(what, options, callback) {
       polling = setTimeout(getTestResults.bind(this, testId,
         resultsOptions, poll.bind(this)), options.pollResults);
     } else {
+      if (!data) {
+        data = {testId: testId};
+      }
       resultsCallback(err, data);
     }
   }