Fix #26: use correct username and domain for dashboard users.

For some reason the username and domain returned by the dashboard for a user were being ignored when constructing the `user_key`.  For federatedID users where the username is not the email, this caused the user key to differ from the one constructed for directory users.

Author: adobeDan

user_sync/rules.py

@@ -663,7 +663,7 @@ def get_dashboard_user_key(dashboard_user):
         '''
         :type dashboard_user: dict
         '''
-        return RuleProcessor.get_user_key(None, None, dashboard_user['email'])
+        return RuleProcessor.get_user_key(dashboard_user['username'], dashboard_user['domain'], dashboard_user['email'])
 
     @staticmethod
     def get_user_key(username, domain, email):