r20775: - use the schema_fsmo module on the schema partition, which loads the schema

r20775: - use the schema_fsmo module on the schema partition, which loads the schema
  if it's already in the ldb
- reopen the ldb after applying the schema, to that we use the loaded schema
  when we apply the config and domain partition objects

metze
(This used to be commit 6d320ec19cac00059649703fc0455ba0ba3a16e6)