Remove ssf from slapd-schema.conf

David A. Cooper <david.cooper@nist.gov> (ITS#1232)
according to draft-ietf-ldapbis-dn-05.txt

A copyright statement follows:

  The functions normalize_unicode(), get_hexpair(), write_hex_pair(),
  get_next_byte(), get_next_char(), get_ber_length(),
  ber_parse_primitive_string(), ber_parse_string(), String_normalize(),
  DirectoryString_normalize(), PrintableString_normalize(),
  IA5String_normalize(), ber_parse_primitive_bitstring(),
  ber_parse_bitstring(), getNext8bits(), bitString_normalize(), match_oid(),
  match_key(), get_validated_av_in_dn(), get_validated_rdn_in_dn(),
  and get_validated_dn() in this file were developed at the National Institute
  of Standards and Technology by employees of the Federal Government in the
  course of their official duties. Pursuant to title 17 Section 105 of the
  United States Code the code in these functions is not subject to copyright
  protection and is in the public domain. The copyright for all other code in
  this file is as specified below.

added function cache_find_entry_ndn2id that avoids an unnecessary call to dn_normalize; now dn2id calls this function, while the original function has been left as a wrapper

OpenLDAP 2.x is supported.

and ldap_next_attribute if using newer interface.  Current test for this
is an #if LDAP_API_VERSION >= 2004.

reworked rdn_attrs to use ldap_explode_rdn; maybe we should remove escapes "\" from parts directly in ldap_explode_rdn

by slapd/tools/*; slap_mods_free is needed by ldbm_back_modrdn after
fixing ITS#1184 (at present -DMULTIATTRVAL_RDN is needed when compiling
back-ldbm/modrdn.c to trigger the compilation of new code).

added rdn_attrs: parses a rdn and returns types and values in two arrays (honors '+' separator according to RFC 2253)

for LDBM backends called "dbsync", which takes minimum of one argument up
to 3 args which are sync frequency, # of delays, and delay periods.  See
man page update for "dbsync" configuration for more details.