r23560: - Activate metze's schema modules (from metze's schema-loading-13 patch).

r23560: - Activate metze's schema modules (from metze's schema-loading-13 patch).
- samba3sam.js: rework the samba3sam test to not use objectCategory,
  as it's has special rules (dnsName a simple match)
- ldap.js: Test the ordering of the objectClass attributes for the baseDN
- schema_init.c: Load the mayContain and mustContain (and system...) attributes when
  reading the schema from ldb
- To make the schema load not suck in terms of performance, write the
  schema into a static global variable
- ldif_handlers.c: Match objectCategory for equality and canonicolisation
  based on the loaded schema, not simple tring manipuation
- ldb_msg.c: don't duplicate attributes when adding attributes to a list
- kludge_acl.c: return allowedAttributesEffective based on schema results
  and privilages

Andrew Bartlett
(This used to be commit dcff83ebe463bc7391841f55856d7915c204d000)