changed regex for backup_dir (allow empty backup-dir to disable backups)

Florian Schaal

2016-03-17 93e7c2d51119be25b34fec4b2eb5771f40cf7d31

1
ALTER TABLE `client` ADD `default_slave_dnsserver` INT( 11 ) UNSIGNED NOT NULL DEFAULT '1' AFTER `limit_dns_zone`;