* Save the master seed upon first challenge so it can be used as a
challenge at a later point.
* When verifyKey() is called, verify that the challenge is successful.
* Uncheck YubiKey box to not leak information about how the database is
protected.
Signed-off-by: Kyle Manna <kyle@kylemanna.com>
QMessageBox displays modal dialogs which blocks the gui tests.
To work around this we add a MessageBox wrapper class where
the tests can set the answer for the next dialog.
The answer is then returned without actually showing the dialog.
