Name dhcp object differently when we use migration-dhcp
Hello, For now if we migrate an old dhcp we see it with cn=dhcp. I think it would be better to name it cn=dhcp-$system ($system is on which server was the dhcp service)
I think it's more clear and we avoid the possibility to have a conflict because we have the same cn.
(from redmine: issue id 5296, created on 2017-01-02, closed on 2017-01-09)