linked attributes, DRS and abusing the ldb modules API

[tridge at samba.org]

Hi Metze,

 > I think the repl_meta_data module should not pass the control down to
 > the partition module when applying replicated changes. Then the
 > partition module can find out the correct location of the object.

That is what it used to do. It failed because the partition module
found the object already existed when DRS was doing an add. This is
because the partition module finds the object in the base partition.

Cheers, Tridge