UTF8 dn_normalize() and when to load ucdata

[Stig Venås <venaas@alfa.itea.ntnu.no>]

Since my new dn_normalize() uses the unicode functions, the ucdata
must be loaded before the first call to dn_normalize(). Currently
dn_normalize() is called first time in read_config(), while the
ucdata is loaded afterwards in schema_prep().

Stig