Create webdriver, assign it to ``self.driver``, and run webdriver
        initiation process, which is usually used for manual login.

def _create_driver(self, **kwargs):
        """
        Create webdriver, assign it to ``self.driver``, and run webdriver
        initiation process, which is usually used for manual login.
        """
        if self.driver is None:
            self.driver = self.create_driver(**kwargs)
            self.init_driver_func(self.driver)