Update Synapse login string

Author: lbeckman314

fence/resources/openid/synapse_oauth2.py

@@ -142,7 +142,7 @@ def get_auth_info(self, code):
                         return dict(error="Required claim {} not found".format(claim))
                 else:
                     rv[claim] = value
-            rv["fence_username"] = rv["userid"] + " (Synapse ID)"
+            rv["fence_username"] = rv["userid"] + "@synapse.org"
             return rv
         except Exception as e:
             self.logger.exception("Can't get user info")