Please review : [Bug 592397] Upgrade tool dn2rdn: it does not clean up the entrydn in id2entry

[Noriko Hosoi]

https://bugzilla.redhat.com/show_bug.cgi?id=592397

https://bugzilla.redhat.com/attachment.cgi?id=454233&action=diff
https://bugzilla.redhat.com/attachment.cgi?id=454233&action=edit

Description: If entries created by the 389 v1.2.5 or older,
the primary db (id2entry.db4) contains "entrydn:<normalized dn>".
Upgrading from the old version to v1.2.6 keeps the entrydn
attribute type and its value even though v1.2.6 is not supposed
to store the entrydn in the database.
1) This patch drops the entrydn attribute and value in upgrading
    the db.
2) If an ldif file contains entrydn attribute type and value,
    import (ldif2db[.pl]) ignores it.
3) A leak was found in the export (db2ldif[.pl]) which is fixed.
4) When nsslapd-subtree-rename-switch configuration attribute has
    the value "on", entrydn is not used nor created.  But the
    server accepted reindexing entrydn request and generated an
    entrydn index file.  This patch rejects it.
5) Entry and dn cache clear calls (cache_clear) are added to
    dblayer_instance_close in "#if defined(_USE_VALGRIND)", which
    is not defined.  To enable the code, the server needs to be
    rebuilt with defining the macro.  This is purely for debugging.

Files:
  ldap/servers/slapd/back-ldbm/dblayer.c
  ldap/servers/slapd/back-ldbm/id2entry.c
  ldap/servers/slapd/back-ldbm/import-threads.c
  ldap/servers/slapd/back-ldbm/ldbm_entryrdn.c
  ldap/servers/slapd/back-ldbm/ldif2ldbm.c
  ldap/servers/slapd/entry.c
  ldap/servers/slapd/slapi-plugin.h