Issue 5247 - BUG - Missing attributes in samba schema

Bug Description: When using 389ds as an authentication backend for samba, a specific set of
attributes and objectclasses is required. Some of these were missing which currently prevents
correct operation of the backend.

Fix Description: Update to the latest sambav3 schema.

fixes: 389ds#5247

Author: William Brown <william@blackhats.net.au>

Review by: ???