(ITS#4322) back-relay should be more user-friendly

[richton@nbcs.rutgers.edu]

Full_Name: Aaron Richton
Version: 2.3.16
OS: Solaris 9
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (128.6.31.135)


I don't think multiple back-relay targets are supported quite yet. So if one
configures

database relay
suffix "dc=virtual"
relay "dc=real1"
relay "dc=real2"

disaster strikes--slapd just hangs when you try to use the dc=virtual. Until
such time as back-relay can handle this, slapd should yell at you as part of
config parsing.

(If I'm wrong and back-relay is supposed to support multiple targets, then it's
broken and should be fixed.)