executor/pdu: fixes for reserved_port_ids
executor/pdu: Set reserved_port_ids in the constructor. Set reserved_port_ids value in the constructor method. Also given that reserved_port_ids is a list, make sure the default value is an empty list.
executor/pdu: handle the reserved ports in SnmpPDU. Reserved ports should be handled in the method "ports".
Fixes: https://gitlab.freedesktop.org/mupuf/valve-infra/-/issues/103
With this MR, all items from https://gitlab.freedesktop.org/mupuf/valve-infra/-/issues/84 are implemented.
Edited by Ana Guerrero