- Make the example slapd.conf use mdb as examples.
 - Remove BDB dependency from default build.
- Enable SSP by default.

  This is the culmination of years of work and testing including work by jlh@.

  This will enable SSP by default for all amd64 releases, and i386 releases
  10.0 and over.

With hat:	portmgr
Tested by:	multiple exp-runs, CFT package repository, CFT ports
Discussed with:	bapt, antoine