Patch from "Stefan (metze) Metzmacher" <metze@metzemix.de>

Patch from "Stefan (metze) Metzmacher" <metze@metzemix.de>
to extend the ADS_STATUS system to include NTSTATUS, and to provide a better
general infrustructure for his sam_ads work.

I've also added some extra failure mode DEBUG()s to parts of the code.

NOTE:  The ADS_ERR_OK() macro is rather sensitive to braketing issues - without
the final set of brakets, the test is essentially inverted - causing some
intersting 'error = success' messages...

Andrew Bartlett
(This used to be commit 5b9a7ab901bc311f3ad08462a8a68d133c34a8b4)