r21549: Only create DISP_INFO structs for domain handles, the others don't need
them. It just does not make sense to do a querydispinfo on an alias handle...
This fixes a memleak: Every samr_connect*() call leaked a DISP_INFO for the
(NULL) sid.
More cleanup pending: Essentially, we only need the DISP_INFO cache for the
get_global_sam_sid() domain. BUILTIN is fixed and small enough, and there are
no other domains around where enumerations could happen.
This also removes the explicit builtin_domain flags. I don't think this is
worth it. If this makes a significant difference, then we have a *VERY* tuned
RPC layer...
Jeremy, please check this. If it's ok, we might want to merge it across.
Volker