use app name to verify iarc getappinfo response (bug 941228)

IARC seems to be allowing one security code for use with different submission IDs. It's akin to them giving us a password, 'bob123', and telling us it works for 'bob' (bob/bob123), but then it also works for 'alice' (alice/bob123). That's bad.

As a weak measure, I at least verify that the app's name in the ```GetAppInfo``` response is the same as the app trying to attain the content rating.