(ITS#5622) slapo-memberof erroneously using o_dn instead of o_ndn in internal ops

[ando@sys-net.it]

Full_Name: Pierangelo Masarati
Version: HEAD/re24
OS: irrelevant
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (82.63.140.131)
Submitted by: ando


As spotted by Andrew Bartlett
<http://www.openldap.org/lists/openldap-technical/200807/msg00126.html>,
slapo-memberof is using the wrong DN to set the operation's identity while
performing internal ops.  A fix is coming.

p.