dpif-netdev: use the open_type when creating the local port

dpif-netdev: use the open_type when creating the local port

Instead of using the internal type, use the port_open_type when creating the
local port. That makes sure that whenever dpif_port_query is used, the netdev
open_type is returned instead of the "internal" type.

For other ports, that is already the case, as the netdev type is used when
creating the dp_netdev_port.

That changes the output of dpctl when showing the local port, and also when
trying to change its type. So, corresponding tests are fixed.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
Signed-off-by: Daniele Di Proietto <diproiettod@vmware.com>