Make use of declared db_host_port

The port to connect to MySQL-Server was previously always assumed as
the default one. So the library was incompatible to db's on nonstandard
ports

Related Task: [https://fs.golderweb.de/index.php?do=details&task_id=68 FS#68]

mysqlred.py

@@ -49,6 +49,7 @@ class MysqlRed:
     # in descendant classes
     connection = False
     db_hostname = config.db_hostname
+    db_port = config.db_port
     db_username = config.db_username
     db_password = config.db_password
     db_name = config.db_username + jogobot.config['db_suffix']
@@ -71,6 +72,7 @@ class MysqlRed:
 
             type( self ).connection = mysqldb.connect(
                 host=type( self ).db_hostname,
+                port=type( self ).db_port,
                 user=type( self ).db_username,
                 passwd=type( self ).db_password,
                 db=type( self ).db_name )