Sometimes results can be success values but not S_OK, so this change
contains code which will force the result to S_OK in those cases so that
the caller doesn't get an indication which makes it believe that there is
an error.
The ADSI API is supposed to support the notion of only returning
a fixed number of results from AD when we specify the
ADS_SEARCHPREF_SIZE_LIMIT value in the search parameters, but it
doesn't appear to do that (at least not my Win2k setup).
This change includes a bit more debugging output and keeps track of
the number of rows processed so that the maximum site is actually
honoured.
