idviews: Enforce objectclass check in idoverride*-del
Even with anchor to sid type checking, it would be still
possible to delete a user ID override by specifying a group
raw anchor and vice versa.
This patch introduces a objectclass check in idoverride*-del
commands to prevent that.
https://fedorahosted.org/freeipa/ticket/5029
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>