This allows us to test out the code that will do the modify of the
prefixMap, and to provide the bindings that may assist a future
upgrade script.

Andrew Bartlett

We were failing because CN=Deleted Objects, which is marked as
'deleted' itself, could not be re-added in a reprovision.

Andrew Bartlett

the changes from Matthias didn't take account of url and lp being None
in some ldb python instances in 'make test'

- Centralise the lookups for the default domain (root) in the call "domain_dn"
- Reduce the LDB connections attempts ("connect" calls) from three to one
  - tools should load faster
- Make the LDB connection init more like the "ldb_wrap_connection" call
- Load the right UTF8 casefolder which fixes up problems with special characters
  (discovered by me: e.g. small "Umlaute" (ä, ö, ü, ...) in the DN weren't upcased
  - so records "seemed" lost in TDB)

The Samba4 schema code (called via
samdb.set_schema_from_ldb(schema.ldb)) manages the @ATTRIBUTES and
@INDEXLIST records, so don't wipe them early.  The chances are that we
will not change them anyway.

Andrew Bartlett

This fixes the recursive delete in erase_partitions()

For reasons I cannot understand, it is possible to get 'no such
object' trying to delete a DN I just search for without error.  Oh
well...

Andrew Bartlett

This makes it possible to do a bit more of the provision with Samba
helpers, but without some of the otherwise useful things (such as
loading in the global schema) that SamDB does.

Rewrite provision_erase to use a recursive search, rather than a
looping subtree search.  This is much more efficient, particularly now
we have one-level indexes enabled.

Delete the @INDEX and similar records *after* deleting all other
visible records, this hopefully also assists performance.

Andrew Bartlett