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It broke because of the test that the response RP ID hash was actually
the hash of the RP ID. (Which isn't true when using an AppID hash.)

Obviously we were missing test coverage here, so add that now that it's
easy to do with VirtualFidoDevice. (Confirmed that the test failed
before the rest of these changes and passes now.)

Change-Id: Ibd3b39339500e24f00c4f6c12ab4405ae0596107
Reviewed-on: https://chromium-review.googlesource.com/1159522Reviewed-by: Jun Choi <hongjunchoi@chromium.org>
Commit-Queue: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580197}