db_port setting missing (#11284)

If db_port is set in the config.php, services-wrapper will not work.
This fixes the issue and adds a check if db_port is set to be used as the DB port when connecting.
I used 'if SETTING in config' method as this is used below in the script.

services-wrapper.py

@@ -99,6 +99,9 @@ elif config['db_socket']:
 elif ':' in config['db_host']:
     db_server = config['db_host'].rsplit(':')[0]
     db_port = int(config['db_host'].rsplit(':')[1])
+elif 'db_port' in config:
+    db_server = config['db_host']
+    db_port = config['db_port']
 else:
     db_server = config['db_host']
     db_port = 0