back-perl config

[Howard Chu <hyc@symas.com>]

back-perl has not been migrated to support cn=config yet. Conversion looks 
pretty straightforward, but for one detail. Currently slapd.conf will send any 
unrecognized keywords to the perl module's config handler to give it a chance 
to implement whatever it needs. I suggest adding a new perlconfig keyword for 
this purpose instead.

Also, it's not clear that we have any way to convey dynamic config changes 
(mainly deletes) to the perl module. Suggestions?
--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/