Add a random_seed to the contextInfo so that the unit tests complete.

resources/static/test/qunit/mocks/xhr.js

@@ -41,7 +41,8 @@ BrowserID.Mocks.xhr = (function() {
       domain_key_creation_time: (new Date().getTime() - (30 * 24 * 60 * 60 * 1000)),
       csrf_token: "csrf",
       authenticated: false,
-      code_version: "ABC123"
+      code_version: "ABC123",
+      random_seed: "H+ZgKuhjVckv/H4i0Qvj/JGJEGDVOXSIS5RCOjY9/Bo="
     };
 
   // this cert is meaningless, but it has the right format