At 795c7b0a the external dependencies was changed from trying
to import 'ldap' to checking than 'pyldap' package was installed.
The problem is that pyldap is a unmaintained library that should no
longer be used, as explained on the package page:
https://pypi.org/project/pyldap/


"The pyldap fork was merged back into python-ldap, and released as
 python-ldap 3.0.0."

Having pyldap version >= 3.0 installs python-ldap automatically and
will not cause any issue.

The Debian control file package name is adapted to use the latest.

The "ldap" externalm dependency defined in __manifest__.py will cause
pkg_resources.get_distribution() to fail in both case ("python-lap" or
"pyldap"), but the "import" fallback will succeed. For that reason, the
log warning is turned into a log info.

closes odoo/odoo#43769

Note: This library should be replaced by the pure python "ldap3" library.
X-original-commit: 1afd0ccf
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>