(ITS#7483) back-mdb slapcat missing entries behavior

[ebackes@symas.com]

Full_Name: Emily Backes
Version: RE24/HEAD
OS: 
URL: 
Submission from: (NULL) (98.155.30.248)


When given a database with missing entries, e.g. from slapadd of bad or
incomplete data, slapcat on back-bdb returned even the orphaned children. 
Slapcat on back-mdb had inconsistent behavior, sometimes resulting in many more
missing entries and sometimes resulting in segv.

This is a problem only in slapcat, and should be fixed in 

commit e4ec2be93d675b120f1bffbff497d9ed8628c2a6 Better handling of missing
entries

(Thanks Howard!)