ldap: Fix issues in the LDAP module defected after the Python3 upgrade
ldap: Fix issues in the LDAP module defected after the Python3 upgrade

* Fix the ldap import
* Translate the binary strings from ldap to decoded strings

Signed-off-by: Pablo Saavedra <e98b8d93fe1b09b22b237dde7b57addaff055123@igalia.com>

psaavedra/matrix-bot,psaavedra/matrix-bot