[feature/passwords] Add get_name() method to drivers

This will allow us to actually properly differentiate between the available
drivers.

PHPBB3-11610

phpBB/phpbb/crypto/driver/interface.php

@@ -65,4 +65,11 @@ interface phpbb_crypto_driver_interface
 	* @return string	String containing the hash settings
 	*/
 	public function get_settings_only($hash, $full = false);
+
+	/**
+	* Get the driver name
+	*
+	* @return string	Driver name
+	*/
+	public function get_name();
 }