samba_upgradeprovision: Do not reset every DN when changing an SD

samba_upgradeprovision: Do not reset every DN when changing an SD

SD propogation is handled by an LDB module, we do not need to touch each
and every DN to make it happen.

Now that we do not need to put this via a hash, the dnToRecalculate
list is changed to be a list of Dn objects, not strings so that:

if dn in listWellknown

is handled using a schema comparison (avoiding different case forms
tripping it up).

Andrew Bartlett

Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit d5d88bd82b1cb51da09cf3b3dec40f180f5ed29f)