Patch to add security descriptors to the SAMR pipe.

Patch to add security descriptors to the SAMR pipe.

This is not the final solution, I think this will probably changed with the
move to the new SAM subsystem, but it allows some research and gives us
somthing to start with.

It should also help with getting proper NT_TOKEN passing set-up.

Original patch by "Kai Krueger" <kai@kruegernetz.de>, which I have modified to
pass back NTSTATUS returns in more places and to use a little more common code.

Andrew Bartlett
(This used to be commit 43b72493708e74e089989db42a003a3862c793e6)