[PATCH] use tdbbackup, not shutil.copy, skip 'upgrade' of privileges.ldb

[Andrew Bartlett]

This series of patches (in on and top of my upgradeprovision branch)
makes an important fix to the upgrade code, because calling shutil.copy
is NOT A SAFE WAY to deal with tdb (indeed any) databases.

Andrew Bartlett
-- 
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org

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