Resets the app's key on the `unicore.hub` server.

        :returns: str -- the new key

def reset_key(self):
        """
        Resets the app's key on the `unicore.hub` server.

        :returns: str -- the new key
        """
        new_key = self.client.reset_app_key(self.get('uuid'))
        self.data['key'] = new_key
        return new_key