in some cases, back-meta needs to propagate pseudo-root identity even if it's not the authorizing backend

rework internal functions - need the parsed list of URIs before massaging; no impact on exposed funcs

This is necessary to compensate for a regression in the SLAPI
implementation since it moved to an overlay: global add preop
plugins no longer have access to operational attributes,
because slap_mods_opattrs() is called by fe_op_add(), invoked
after the global SLAPI overlay.

(Some of our plugins need to the structural object class of the
to-be-added entry.)

I suppose an option would be to have the SLAPI overlay
optimistically call slap_mods_opattrs() (as long as this can be
called idempotently). If there are any other ideas let me know.

patch from Jason Townsend

  "ABANDON", "STARTTLS", "CANCEL", "WHOAMI", "PASSMOD", "EXT", "INTERM",
  "TLS established", SASL and Extended Response "RESULT".
In Statslog output "conn=xx fd=yy closed", append the reason in
  "()" unless client or server closed the connection after Unbind.
Still missing Statslog output from a number of failed requests.

  Removes ITS#3824 patch.
  Adds trace message for ITS#3833.
  Streamlines ITS#3607 patch.

appropriate IANA assigned OIDs, and remove hide.

add authzSyntax for authzTo/authzFrom attributes; add X-ORDERED 'VALUES' if support for ordered_value_{validate,pretty,normalize} is present; exploit normalization in slap_parseURI (only #ifdef LDAP_DEVEL)