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This makes GetAssertionOperation decrypt the matching credential id
id into its UserEntity value and carry those values as well as the
credential id into the returned response. It was previously returning
incomplete responses.

Also fix the signature counter to 1, rather than 0, because webauthndemo
insists that the number be greater than 0.

Bug: 803842
Change-Id: I42e22ca9fb571ad6dea924bd765aa276d8c62d1a
Reviewed-on: https://chromium-review.googlesource.com/1103518
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568720}