Ticket 47318 - server fails to start after upgrade(schema error)
Bug Description: After upgrading the server fails to start because the Root DN
access control plugin's entry changed to include nsslapd-Plugin
objectclass.
Fix Description: Update the schema to allow nsslapd-plugin-depends-on-type in
the nsslapdPlugin objectclass.
https://fedorahosted.org/389/ticket/47318
Reviewed by: nhosoi(Thanks!)
(cherry picked from commit b139ff8e404bccacf88c34c03637da0e9c4c2a0d)