data/settings: Add auth_master_socket_path

Author: sirainen

data/settings.js

@@ -4600,6 +4600,17 @@ auth_realms = example.com another.example.com foo
 		text: `
 The UNIX socket path to the master authentication server for finding users.
 
+It is usually neither necessary nor advisable to change the default.`
+	},
+
+	auth_master_socket_path: {
+		default: 'auth-master',
+		advanced: true,
+		values: setting_types.STRING,
+		text: `
+The UNIX socket path to the master authentication server for finishing
+user logins.
+
 It is usually neither necessary nor advisable to change the default.`
 	},