login/authldap: ignore strong auth required when testing connection
On some OpenLDAP-based identity management systems (such as Æ-DIR),
anonymous connections are not permitted for ldapsearch and OpenLDAP
is configured to return strongerAuthRequired in this circumstance.
This causes failures when trying to set up Ipsilon to connect to
Æ-DIR.
Thanks to Michael Ströder for reporting this issue and suggesting
the fix.
Co-authored-by: Michael Ströder <michael@stroeder.com>
Signed-off-by: Neal Gompa <ngompa13@gmail.com>