r15957: - add a test that fetches the schema from an windows LDAP server,

r15957: - add a test that fetches the schema from an windows LDAP server,
  and stores it into structures.
- this prints out some useful information on the screen about
  attributes (will be extended for objectClasses too)
- the plan is to create hide the relation of structures behind an interface
  we can later use this interface in a lot of places:
  - our schema module for ldb
  - the ndr_print code for DsGetNCChanges, to translate the uint32 attribute
    and objectClass id's into names, display attribute values depending on the
    attribute syntax
  - ...

metze
(This used to be commit 1908f0cd6230c22aabb0e1eab2f9d37d17f12f18)