[LDB] Store index DNs as canonical case

[Andrew Bartlett]

The attached patch reworks our index code to always store the canonical
casefolded form of the DN in an index.  It does not work yet, and needs
to add a 'index version' to the ldb to trigger a reindex.  The
casefolded index entries should be backward compatible, because the
previous code accepted any case variation, so we are simply being more
strict in what we now write.  

This was inspired by a bug where we would not delete index entries
because the DN was not in a canonical from, and the existing
strcasecmp() didn't match.  

(strcasecmp isn't the right option any more anyway)

This stems from the fact that LDB DNs were just case-insensitive strings
originally, but have become far more complex since then. 

Any comments would be most welcome while I chase down the remaining
issues. 

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