[389-devel] Please review: Reduce the number of DN normalization

[Noriko Hosoi]

Reduce the number of DN normalization

. Replacing SLAPI_TARGET_DN with SLAPI_TARGET_SDN (also its macros,
   e.g., SLAPI_SEARCH_TARGET_SDN and SLAPI_ADD_TARGET_SDN).
. Replacing the type of SLAPI_MODRDN_NEWSUPERIOR from (char *) to
   (Slapi_DN *), as well.
. Replacing slapi_dn_normalization_ext call with generating Slapi_DN
   APIs (e.g., slapi_sdn_new_dn_...) as much as possible and stash it
   in pblock using SLAPI_TARGET_SDN.
. When a normalized DN string is needed, get it using slapi_sdn_get_[n]dn
   from the stashed Slapi_DN.
. Introduced a new field to Slapi_DN.
   "udn" for the original DN; "dn" is a normalized DN; "ndn" is a case-
   ignored normalized DN.
   Taking advantage of the knowledge of the stage of the DN, call the
   most efficient DN creating API (e.g., slapi_sdn_new_dn_... vs.
   slapi_sdn_new_normdn_... vs. slapi_sdn_new_ndn_...)

Others
. Replacing inefficient array assignment with memset (acl.c) and
   memcpy (idl_common.c).
. Fixing invalid memory access in LASDnsBuild (lib/libaccess/lasdns.cpp).
. Even if Slapi_counter is disabled, the server is allowed to start
   (back-ldbm/cache.c).
. Fixing compiler warnings.

Sorry, it's huge...
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