Ticket 49447 - PBKDF2 on upgrade
Bug Description: We changed the default password hash mech to
PBKDF2 on upgrade - but if the upgrade from 1.3.x to 1.4.x,
this new plugin object doesn't exist. This causes the server to
fail to start.
Adittionally, one could imagine an admin error could cause this
also to be omitted
Fix Description: Create and bootstrap the plugins on startup
https://pagure.io/389-ds-base/issue/49447
Author: wibrown
Review by: mreynolds