add hostname to backup-archives created by the updater

Author: Florian Schaal

install/update.php

@@ -190,7 +190,7 @@
 if($do_backup == 'yes') {
 
 	//* Create the backup directory
-	$backup_path = '/var/backup/ispconfig_'.@date('Y-m-d_H-i');
+	$backup_path = '/var/backup/ispconfig_'.$conf['hostname'].'_'.@date('Y-m-d_H-i');
 	$conf['backup_path'] = $backup_path;
 	exec("mkdir -p $backup_path");
 	exec("chown root:root $backup_path");