dbcheck: Find and fix a missing Deleted Objects container

dbcheck: Find and fix a missing Deleted Objects container

Older Samba versions could delete this.  This patch tries very hard
to put back the original object, with the original GUID, so that
if another replica has the correct container, that we just merge
rather than conflict.

The existing "wrong dn" check can then put any deleted objects
under this container correctly.

Pair-programmed-with: Garming Sam <garming@catalyst.net.nz>
Pair-programmed-with: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>