ULC: fix: upgrade for stage Stage User Admins failed
Upgrade failed because entry 'dn: cn=Stage User
Administrators,cn=privileges,cn=pbac,$SUFFIX' doesnt exist.
Now upgrade will create the privilege if it does not exist.
https://fedorahosted.org/freeipa/ticket/3813
Reviewed-By: David Kupka <dkupka@redhat.com>