LAM 6.7 with YubiKey 2FA and extended Bind DLZ support

YubiKey server is supported as 2-factor authentication provider for LAM login. The bind DLZ module supports DNAME and XFR records. LAM is also compatible with PHP 7.3 and can log to a remote syslog server. In addition, multiple fields were added to self service and you can configure its base URL for email sending. There is also a new Shadow account expiration notification job.