LDAP connectivity issues on startup cause fatal initialization error when passwordDB=AD

Concerned version

Version: %2.0.14

Platform: Any

Summary

LDAP connectivity issues on startup cause fatal initialization error when passwordDB=AD

This is exactly the same bug as #2410 (closed), but for AD backend.

Logs

[Mon Mar 28 08:32:31 2022] [LLNG:95623] [error] Connection refused
[Mon Mar 28 08:32:31 2022] [LLNG:95623] [error] LDAP initialization error: Connection refused
[Mon Mar 28 08:32:31 2022] [LLNG:95623] [error] Lemonldap::NG::Portal::Password::AD init failed
[Mon Mar 28 08:32:31 2022] [LLNG:95623] [debug] [error] Lemonldap::NG::Portal::Password::AD init failed

Backends used

AD as PasswordDB backend

Possible fixes