samba_upgradeprovision: Use tdb_util.tdb_copy not shutil.copy2
This is really important, because copying a file will both ignore
locks held by another process and break any locks we hold (due to
POSIX brain-damage regarding multiple fds on one file in a process).
By leaving this to tdbbackup in a child, both of these issues are avoided.
Andrew Bartlett
Reviewed-by: Matthieu Patou <mat@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Tue Feb 19 07:48:18 CET 2013 on sn-devel-104
(cherry picked from commit
2cf83f7c645e4b216cf6f23857fd72ec0e6ca7a6)